Nonsurgical Management of High- Risk Lesions Diagnosed at Core Needle Biopsy: Can Malignancy Be Ruled Out Safely With Breast MRI?

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                                                                                                                                                     Linda et al.
                                                                                                                                                     MRI of High-Risk Breast Lesions

                                                                                                                                                     Women’s Imaging
                                                                                                                                                     Original Research

                                                                                                                                                                                                                 Nonsurgical Management of High-
                                                                                                                                                                                                                 Risk Lesions Diagnosed at Core
                                                                                                                                                                     FOCUS ON:
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                                                                                                                                                                                                                 Needle Biopsy: Can Malignancy Be
                                                                                                                                                                                  JOURNA L      CLUB             Ruled Out Safely With Breast MRI?
                                                                                                                                                     Anna Linda1                                                    OBJECTIVE. The purpose of this study was to investigate whether breast MRI can be
                                                                                                                                                     Chiara Zuiani1                                              used to rule out malignancy in patients with high-risk lesions diagnosed at imaging-guided
                                                                                                                                                     Alessandro Furlan2                                          core needle biopsy.
                                                                                                                                                     Michele Lorenzon1                                              SUBJECTS AND METHODS. The subjects were women consecutively registered be-
                                                                                                                                                     Viviana Londero1                                            tween October 2004 and April 2010 who had high-risk lesions diagnosed at mammographi-
                                                                                                                                                                                                                 cally or sonographically guided core needle biopsy and subsequently underwent MRI and
                                                                                                                                                     Rossano Girometti1
                                                                                                                                                                                                                 surgical excision. MR images were reviewed by two experienced breast radiologists. Lesions
                                                                                                                                                     Massimo Bazzocchi1                                          assessed as BI-RADS category 1–3 were considered negative for malignancy, and BI-RADS
                                                                                                                                                     Linda A, Zuiani C, Furlan et al.                            4 and 5 lesions were considered malignant. Histologic findings at surgical excision were the
                                                                                                                                                                                                                 reference standard. The sensitivity, specificity, and positive and negative predictive values of
                                                                                                                                                                                                                 MRI in the detection of associated malignancy were calculated for the entire set of lesions
                                                                                                                                                                                                                 and for each histologic subtype.
                                                                                                                                                                                                                    RESULTS. The final sample consisted of 169 high-risk lesions in 166 patients. At
                                                                                                                                                                                                                 MRI analysis, 116 (68.6%) lesions were considered negative for malignancy, and the other
                                                                                                                                                                                                                 53 (31.4%) malignant. At surgical excision, 22 malignant lesions were found. The overall
                                                                                                                                                                                                                 sensitivity, specificity, and positive and negative predictive values of MRI were 72.7% (16/22),
                                                                                                                                                                                                                 74.8% (110/147), 30.2% (16/53), and 94.8% (110/116). The negative predictive values for
                                                                                                                                                                                                                 papilloma, radial scar, lobular neoplasia, and atypical ductal hyperplasia were 97.4% (38/39),
                                                                                                                                                                                                                 97.6% (41/42), 88.0% (22/25), and 90.0% (9/10).
                                                                                                                                                                                                                    CONCLUSION. Patients with high-risk lesions associated with the lowest likelihood
                                                                                                                                                                                                                 of malignancy (papilloma and radial scar) and without suspicious MRI findings can safely
                                                                                                                                                                                                                 undergo follow-up instead of surgery. Because of the low negative predictive value, however,
                                                                                                                                                                                                                 MRI is not helpful in cases of lobular neoplasia and atypical ductal hyperplasia, and all these
                                                                                                                                                                                                                 lesions should be excised.

                                                                                                                                                                                                                   T
                                                                                                                                                                                                                             he pathologic diagnosis high-            gated, but published data are contradictory
                                                                                                                                                                                                                             risk lesion accounts for as many         and nonconclusive [10–18]. In two studies
                                                                                                                                                     Keywords: borderline lesions, breast MRI, core needle
                                                                                                                                                     biopsy, high-risk lesions, underestimation
                                                                                                                                                                                                                             as 9% of all imaging-guided core         [19, 20], breast MRI was evaluated for pre-
                                                                                                                                                                                                                             needle biopsies (CNBs) [1–6].            operative detection of malignancy associated
                                                                                                                                                     DOI:10.2214/AJR.11.7040                                     These lesions include lobular neoplasia (LN)         with high-risk lesions, and the results were
                                                                                                                                                                                                                 (lobular carcinoma in situ, atypical lobular         promising. The studies, however, were lim-
                                                                                                                                                     Received April 15, 2011; accepted after revision
                                                                                                                                                                                                                 hyperplasia), atypical ductal hyperplasia            ited by retrospective design [19] and a rela-
                                                                                                                                                     July 22, 2011.
                                                                                                                                                                                                                 (ADH), papilloma, and radial scar. Because           tively small sample size, which did not allow
                                                                                                                                                     1
                                                                                                                                                       Institute of Diagnostic Radiology, Azienda Ospedaliero–   the reported risk of associated malignancy at        analysis by lesion [19, 20]. We undertook a
                                                                                                                                                     Universitaria Santa Maria della Misericordia, P.le S.       surgical excision seems to vary widely (0–           large prospective study to investigate wheth-
                                                                                                                                                     Maria della Misericordia, 33100 Udine, Italy. Address       35%) [2–7], these lesions are usually man-           er breast MRI can be used to safely rule out
                                                                                                                                                     correspondence to A. Linda (annalinda33@gmail.com).
                                                                                                                                                                                                                 aged surgically. However, surgical excision          malignancy in patients with high-risk lesions
                                                                                                                                                     2
                                                                                                                                                       Department of Radiology, University of Pittsburgh,        implies increased cost, patient anxiety [8],         diagnosed at imaging-guided CNB.
                                                                                                                                                     Pittsburgh, PA.                                             and morphologic alteration (i.e., scarring) of
                                                                                                                                                                                                                 the breast that can hamper interpretation of         Subjects and Methods
                                                                                                                                                     AJR 2012; 198:272–280
                                                                                                                                                                                                                 later images [9].                                        The institutional review board approved this study,
                                                                                                                                                     0361–803X/12/1982–272                                          The role of conventional imaging (mam-            which was performed at a large university refer-
                                                                                                                                                                                                                 mography and sonography) in the manage-              ral hospital for breast diseases. All patients provided
                                                                                                                                                     © American Roentgen Ray Society                             ment of high-risk lesions has been investi-          written informed consent to participate in the study.

                                                                                                                                                     272                                                                                                                                          AJR:198, February 2012
MRI of High-Risk Breast Lesions

                                                                                                                                                     Study Sample                                             ages were obtained with a T1-weighted 3D FLASH          [21]. In keeping with the BI-RADS lexicon, an
                                                                                                                                                        This prospective study was performed between          pulse sequence with the following parameters: TR/       assessment of BI-RADS category 1 was used to
                                                                                                                                                     October 2004 and April 2010. Included were wom-          TE, 15/4.7; flip angle, 25°; matrix size, 197 × 448;    indicate absence of contrast enhancement in the
                                                                                                                                                     en 18 years old and older with a diagnosis of high-      FOV, 350 × 175 mm; section thickness, 1.8 mm;           area of the lesion; BI-RADS 2, a benign finding;
                                                                                                                                                     risk lesion (LN, ADH, papilloma, radial scar) at         acquisition time, 1:28 minutes. From June 2009          BI-RADS 3, a probably benign finding; BI-RADS
                                                                                                                                                     imaging-guided CNB who subsequently underwent            through April 2010, axial dynamic contrast-en-          4, a suspicious finding; and BI-RADS 5, a finding
                                                                                                                                                     breast MRI and surgical excision of the lesion. The      hanced images were obtained with a T1-weight-           highly suggestive of malignancy. Because of the
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                                                                                                                                                     exclusion criteria were presence of synchronous or       ed 3D FLASH pulse sequence with the following           selection criteria, BI-RADS category 6 (known
                                                                                                                                                     metachronous carcinoma (ductal carcinoma in situ         parameters: TR/TE, 9/4.7; flip angle, 25°; matrix       cancer) was not considered an option.
                                                                                                                                                     [DCIS], invasive carcinoma) in the same breast;          size, 512 × 512; FOV, 340 × 340 mm; section
                                                                                                                                                     contraindications to MRI (pacemaker, claustropho-        thickness, 2 mm; acquisition time, 1:20 minutes.        Reference Standard
                                                                                                                                                     bia, vascular clip); severe limitation to MR image       Gadobenate dimeglumine (MultiHance, Bracco)                The reference standard was the result at histo-
                                                                                                                                                     interpretation (e.g., movement artifacts); lack of fi-   was administered IV by automated bolus injection        pathologic examination of the surgically excised
                                                                                                                                                     nal pathologic result after surgical excision because    at a dose of 0.1 mmol/kg body weight with a flow        specimen. Invasive cancer and DCIS were classi-
                                                                                                                                                     patient declined surgical treatment or was referred      rate of 2 mL/s immediately followed by flushing of      fied as malignant, and all other pathologic find-
                                                                                                                                                     to an outside hospital; and surgical excision per-       20 mL of saline solution with an automatic injector     ings as benign. Histopathologic examinations
                                                                                                                                                     formed more than 3 months after CNB. Patient en-         (Spectris Solaris, MedRad). Images were acquired        were performed by a breast pathologist with more
                                                                                                                                                     rollment and consent took place at the time of diag-     sequentially once before and five times after injec-    than 10 years of experience.
                                                                                                                                                     nosis of a high-risk lesion.                             tion of the contrast agent, beginning 12 seconds af-
                                                                                                                                                                                                              ter initiation of the contrast injection and with no    Statistical Analysis
                                                                                                                                                     Percutaneous Core Needle Biopsy                          delay between images.                                       Rates of underestimation of malignancy (num-
                                                                                                                                                        Percutaneous CNB was performed under                     Postprocessing and construction of dynam-            ber of high-risk lesions upgraded to malignancy at
                                                                                                                                                     mammographic or sonographic guidance accord-             ic curves were performed at a workstation (Syn-         surgical excision divided by the number of high-
                                                                                                                                                     ing to the judgment of the attending radiologist.        go MultiModality Workplace, Leonardo, Siemens           risk lesions surgically excised) were calculated
                                                                                                                                                     The biopsy procedures were performed by radiol-          Healthcare) by one of five radiologists (more than      overall, for each high-risk lesion type (radial scar,
                                                                                                                                                     ogists with 10–20 years’ experience in breast im-        2 years of experience in breast MRI). Postpro-          papilloma, LN, ADH), and for biopsy type (so-
                                                                                                                                                     aging. In cases of sonographically guided CNB,           cessing included temporal subtraction (all con-         nographically guided CNB, mammographically
                                                                                                                                                     an automated biopsy gun (Magnum Biopsy In-               trast-enhanced images minus unenhanced imag-            guided vacuum-assisted biopsy).
                                                                                                                                                     strument, Bard) or a semiautomated biopsy gun            es) and generation of multiplanar reconstruction            For the purposes of computing the diagnostic
                                                                                                                                                     (Precisa, HS Hospital Service) with a 14-gauge,          and maximum intensity projections. Dynamic sig-         yield of MRI, results of image evaluation were
                                                                                                                                                     15-cm-long needle (throw of needle, 23 mm) was           nal intensity–time curves were constructed for re-      dichotomized as negative for malignancy (BI-
                                                                                                                                                     used. A mean of five core samples (range, three          gions of interest (3 × 3 pixels) positioned with-       RADS categories 1–3) and positive for malig-
                                                                                                                                                     to eight) were obtained per lesion. In cases of          in the lesion on subjectively determined areas of       nancy (BI-RADS categories 4 and 5). Malignant
                                                                                                                                                     small lesions, an amagnetic, sonographically vis-        maximal enhancement.                                    lesions assessed as positive on MR images were
                                                                                                                                                     ible clip (GelMark, UltraCor) was left in place to                                                               considered true-positive cases and those assessed
                                                                                                                                                     mark the biopsy site. In cases in which a mam-           MRI Analysis                                            as negative were considered false-negative cases.
                                                                                                                                                     mographically detected lesion was not identified             The study coordinator (more than 5 years of ex-     Benign lesions assessed as positive on MR imag-
                                                                                                                                                     at sonographic examination, CNB was performed            perience in breast imaging), who was not involved in    es were considered false-positive cases, and those
                                                                                                                                                     under mammographic guidance on a digital prone           further MRI evaluation, reviewed all images avail-      assessed as negative were considered true-nega-
                                                                                                                                                     table (Mammobed Giotto, IMS) with a direction-           able and annotated on a breast map the location of      tive cases. On the basis of these data, the sensitiv-
                                                                                                                                                     al vacuum-assisted biopsy device (Mammotome,             each biopsied lesion using clock-face referents and     ity, specificity, and positive and negative predic-
                                                                                                                                                     Mammotome) with an 11-gauge needle. On aver-             relative distance from the nipple. The maps were dis-   tive values of MRI in the detection of malignancy
                                                                                                                                                     age, 12 core samples (range, nine to 18) were ob-        tributed to the readers before image interpretation.    were calculated. Exact 95% CI was computed for
                                                                                                                                                     tained per lesion. In patients with mammograph-              At acquisition, two independent radiologists        each performance measure. The performance pa-
                                                                                                                                                     ically detected microcalcifications, a specimen          with more than 10 years of experience in breast         rameters were specifically calculated for each
                                                                                                                                                     radiograph was obtained to confirm the presence          imaging, including breast MRI, prospective-             high-risk lesion and for biopsy type. The Pearson
                                                                                                                                                     of calcifications in each sample, and a clip (Mam-       ly evaluated the images at the workstation. Any         chi-square test was used to compare performance
                                                                                                                                                     moMark, Mammotome) was left in place to mark             discrepancy in opinion was resolved by consen-          parameters among groups. A value of p < 0.05
                                                                                                                                                     the biopsy site.                                         sus. The readers were aware of the lesion location      was considered indicative of a statistically sig-
                                                                                                                                                                                                              and of the histologic diagnosis at CNB. So that in-     nificant difference. All statistical analyses were
                                                                                                                                                     MRI Technique                                            formation on the performance of MRI would be            performed with commercially available software
                                                                                                                                                        Breast MRI studies were performed with a 1.5-         obtained independently of mammographic and              (MedCalc 9.2.0.1, MedCalc Software).
                                                                                                                                                     T system (Magnetom Avanto, Siemens Health-               sonographic features, mammographic and sono-
                                                                                                                                                     care) with a dedicated bilateral surface breast coil     graphic images were not available to the readers        Results
                                                                                                                                                     and the patient prone. For premenopausal patients,       at MR image interpretation. Unenhanced and con-         Patients and Lesions
                                                                                                                                                     MRI was performed during the second week of              trast-enhanced MR images were evaluated. Mor-              A total of 3243 imaging-guided CNBs of
                                                                                                                                                     the menstrual cycle. From October 2004 through           phologic and kinetic evaluation and lesion assess-      the breast were performed in our department
                                                                                                                                                     May 2009, coronal dynamic contrast-enhanced im-          ment were based on the BI-RADS MRI lexicon              during the study period. Among them, 2514

                                                                                                                                                     AJR:198, February 2012                                                                                                                                            273
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TABLE 1: Imaging Features of 22 Lesions Diagnosed as High-Risk at Core Needle Biopsy With Finding of Malignancy After Surgical Excision

274
                                                   Core Needle Biopsy               Final Pathologic Finding   Conventional Imaging Finding                                            MRI Finding
                                                                                                                                                              Mass                   Nonmasslike Enhancement
Lesion                    Assessment                                                                     Size                                                          Internal                      Internal      Signal Intensity– BI-RADS
 No.                       of Finding     Diagnosis              Type            Histologic Type, Grade (mm)a Mammography       Ultrasound     Shape      Margin     Enhancement    Distribution   enhancement     Time Curve Type Category
                1b       False-negative Papilloma       Ultrasound core needle   DCIS, low                 4   Occult          Nodule         Lobulated Irregular Homogeneous           —               —                2                     3
                   2     True-positive    Papilloma     Ultrasound core needle   DCIS, low                NA   NA              Dilated ducts Irregular    Smooth    Homogeneous         —               —                3                     4
                   3     True-positive    Papilloma     Ultrasound core needle   DCIS, high               30   NA              Dilated ducts Lobulated Irregular Homogeneous        Regional       Inhomogeneous         2                     4
                   4     True-positive    Papilloma     Ultrasound core needle   DCIS, intermediate       NA   Occult          Nodule         Oval        Irregular Inhomogeneous       —               —                3                     4
                   5     True-positive    Radial scar Ultrasound core needle     ILC, intermediate         5   Distortion      Nodule         Irregular   Irregular Inhomogeneous       —               —                2                     4
                   6     False-negative Radial scar Ultrasound core needle       DCIS, low                 8   Occult          Nodule            —          —            —              —               —                —                     1
                   7     True-positive       LN         Mammographic vacuum ILC, intermediate              4   Microscopic     Occult         Irregular   Irregular Inhomogeneous       —               —                2                     4
                                                        assisted
                   8     False-negative      LN         Mammographic vacuum DCIS, intermediate             4   Microscopic     Occult            —          —            —              —               —                —                     1
                                                        assisted
                   9     True-positive       LN         Mammographic vacuum DCIS, high                     2   Microscopic     Occult         Irregular   Irregular Inhomogeneous       —               —                2                     4
                                                        assisted
               10        True-positive       LN         Ultrasound core needle   Invasive tubulolobular   20   Occult          Nodule         Lobulated Irregular Inhomogeneous         —               —                2                     4
                                                                                  carcinoma,
                                                                                  intermediate
               11        False-negative      LN         Ultrasound core needle   ILC, intermediate         4   Occult          Nodule         Oval        Regular   Homogeneous         —               —                2                     3
               12        True-positive       LN         Ultrasound core needle   ILC, intermediate        10   Occult          Nodule         Irregular   Irregular Inhomogeneous       —               —                2                     4
                                                                                                                                                                                                                                    Linda et al.

               13        True-positive       LN         Ultrasound core needle   ILC, intermediate        11   Occult          Nodule         Oval        Irregular Inhomogeneous       —               —                2                     4
               14        False-negative      LN         Mammographic vacuum DCIS, low                      5   Microscopic     Occult            —          —            —              —               —                —                     1
                                                        assisted
            15c          True-positive       LN         Mammographic vacuum DCIS, low                     NA   Microscopic     Occult            —          —            —          Ductal         Inhomogeneous         2                     4
                                                        assisted
               16        True-positive       LN         Ultrasound core needle   ILC, intermediate         5   Occult          Nodule         Oval        Irregular Inhomogeneous       —               —                2                     4
               17        True-positive       LN         Ultrasound core needle   DCIS, low                NA   Occult          Nodule         Irregular   Irregular Inhomogeneous       —               —                2                     4
               18        True-positive       LN         Mammographic vacuum DCIS, intermediate            NA   Microscopic     Occult         Oval        Irregular Inhomogeneous       —               —                2                     4
                                                        assisted
               19        False-negative      ADH        Ultrasound core needle   DCIS, intermediate       NA   Occult          Hypoechoic        —          —            —              —               —                —                     1
                                                                                                                                area
               20        True-positive       ADH        Mammographic vacuum DCIS, low                      5   Microscopic     Occult            —          —            —          Segmental Inhomogeneous              2                     4
                                                        assisted
               21        True-positive       ADH        Ultrasound core needle   DCIS, low                10   Occult          Hypoechoic        —          —            —          Focal          Inhomogeneous         3                     4
                                                                                                                                area
              22         True-positive       ADH        Mammographic vacuum Invasive ductal-               7   Microscopic     Occult         Round       Irregular Inhomogeneous       —               —                2                     4
                                                        assisted             lobular carcinoma,
                                                                             intermediate
   Note—Note—Dash (—) indicates not assessable. DCIS = ductal carcinoma in situ, NA = not available, ILC = invasive lobular carcinoma, LN = lobular neoplasia, ADH = atypical ductal hyperplasia.
   aNeoplastic component.
   bFigure 4.

AJR:198, February 2012
   cFigure 1.
MRI of High-Risk Breast Lesions

                                                                                                                                                     (77.6%) were performed under sonographic         TABLE 2: Rate of Underestimation of Malignancy at Biopsy
                                                                                                                                                     guidance and 729 (22.4%) under stereotac-
                                                                                                                                                                                                                            No. of                                            Malignancy Underestimation Rate (%)b
                                                                                                                                                     tic guidance. Two hundred forty-one (7.4%)           Pathologic       Lesions
                                                                                                                                                     high-risk lesions were diagnosed consecu-            Diagnosis       at Biopsy             Type of Biopsya                  By Biopsy Type           Overall
                                                                                                                                                     tively in 236 women. Three patients (three
                                                                                                                                                                                                      Papilloma               64      Ultrasound core needle (60)                    6.7 (4/60)          6.2 (4/64)
                                                                                                                                                     lesions) were excluded because of the pres-
                                                                                                                                                     ence of ipsilateral breast cancer. Four pa-                                      Mammographic vacuum assisted (4)                0 (0/4)
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                                                                                                                                                     tients (four lesions) had contraindications to   Radial scar             54      Ultrasound core needle (41)                    4.9 (2/41)          3.7 (2/54)
                                                                                                                                                     MRI. All other patients consented to partici-                                    Mammographic vacuum assisted (13)               0 (0/13)
                                                                                                                                                     pation in the study and were enrolled. How-
                                                                                                                                                                                                      Lobular neoplasia       35      Ultrasound core needle (15)                   40.0 (6/15)         34.3 (12/35)
                                                                                                                                                     ever, 63 patients (65 lesions) did not com-
                                                                                                                                                     plete the study because they were later found                                    Mammographic vacuum assisted (20)             30.0 (6/20)
                                                                                                                                                     to be ineligible owing to the presence of ar-    Atypical ductal         16      Ultrasound core needle (6)                     33.3 (2/6)         25.0 (4/16)
                                                                                                                                                     tifacts limiting MRI interpretation (eight pa-    hyperplasia
                                                                                                                                                     tients with eight lesions) or because they de-                                   Mammographic vacuum assisted (10)             20.0 (2/10)
                                                                                                                                                     clined surgery (55 patients with 57 lesions).    Total                  169      Ultrasound core needle (122)                 11.5 (14/122)       13.0 (22/169)
                                                                                                                                                        The final sample included 166 patients
                                                                                                                                                                                                                                      Mammographic vacuum assisted (47)             17.0 (8/47)
                                                                                                                                                     (mean age, 52.2 years; range, 25–76 years)
                                                                                                                                                     with 169 high-risk lesions. Of these patients,   Note—Values in parentheses are numbers of lesions. CNB = core needle biopsy.
                                                                                                                                                                                                      aValues in parentheses are numbers of lesions.
                                                                                                                                                     164 had one high-risk lesion, one patient had    bValues in parentheses are number of lesions upgraded.
                                                                                                                                                     two synchronous ipsilateral high-risk lesions,
                                                                                                                                                     and one patient had three synchronous high-      category 2, and 45 (26.6%) BI-RADS catego-               The other six (5.2%) lesions (four BI-RADS
                                                                                                                                                     risk lesions, two in one breast and one in the   ry 3. The other 53 (31.4%) lesions were con-             1, two BI-RADS 3) were upgraded to malig-
                                                                                                                                                     other breast. Of the 169 high-risk lesions,      sidered positive: 51 (30.2%) BI-RADS cate-               nancy (false-negative) (Fig. 4). The overall
                                                                                                                                                     122 (72.2%) were biopsied under sonograph-       gory 4 and 2 (1.2%) BI-RADS category 5. Of               sensitivity, specificity, and positive and neg-
                                                                                                                                                     ic guidance and 47 (27.8%) under mammo-          the 53 lesions assessed as positive at MRI, 16           ative predictive values of MRI in the identi-
                                                                                                                                                     graphic guidance. At examination of the biop-    (30.2%) lesions (all BI-RADS 4) proved ma-               fication of malignancy were 72.7% (95% CI,
                                                                                                                                                     sy specimen, 64 (37.9%) lesions were found to    lignant (true-positive) (Fig. 1) at surgical ex-         65–79%; 16/22), 74.8% (95% CI, 67–81%;
                                                                                                                                                     be papilloma without atypia; 54 (31.9%), radi-   cision, and 37 (69.8%) lesions (35 BI-RADS               110/147), 30.2% (95% CI, 23–38%; 16/53),
                                                                                                                                                     al scar; 35 (20.7%), LN; and 16 (9.5%), ADH.     4, two BI-RADS 5) proved benign (false-                  and 94.8% (95% CI, 90–97%; 110/116). The
                                                                                                                                                     The mean interval between biopsy and MRI         positive) (Fig. 2). Of 116 lesions classified            performance parameters for lesions diag-
                                                                                                                                                     was 11 days (range, 3–25 days).                  as negative at MRI, 110 (94.8%) lesions (55              nosed at sonographically guided CNB and for
                                                                                                                                                                                                      BI-RADS 1, 12 BI-RADS 2, 43 BI-RADS                      those diagnosed at mammographically guid-
                                                                                                                                                     Histologic Results at Surgical Excision          3) were confirmed as benign at final patho-              ed vacuum-assisted biopsy are shown in Ta-
                                                                                                                                                        Surgical excision was performed 10–75         logic examination (true-negative) (Fig. 3).              ble 3. The negative predictive values for papil-
                                                                                                                                                     days after biopsy (mean, 23 days) and 6–69
                                                                                                                                                     days after MRI (mean, 19 days). Histopatho-
                                                                                                                                                     logic examination of the surgical specimens
                                                                                                                                                     revealed 22 malignant lesions. Of these, 14
                                                                                                                                                     (63.6%) were DCIS (eight low grade, four
                                                                                                                                                     intermediate grade, and two high grade),
                                                                                                                                                     and the other eight (36.4%) were invasive
                                                                                                                                                     carcinoma (six intermediate-grade invasive
                                                                                                                                                     lobular carcinoma, one intermediate-grade
                                                                                                                                                     invasive ductal-lobular carcinoma, one in-
                                                                                                                                                     termediate-grade invasive tubulolobular car-
                                                                                                                                                     cinoma) (Table 1). The overall biopsy un-
                                                                                                                                                     derestimation rate was 13% (22/169). The
                                                                                                                                                     underestimation rates among lesions diag-
                                                                                                                                                     nosed under sonographic guidance and le-
                                                                                                                                                     sions diagnosed under mammographic guid-
                                                                                                                                                     ance were 11.5% (14/122) and 17.0% (8/47)                                                           A                                                            B
                                                                                                                                                     (p = 0.559) (Table 2).                           Fig. 1—61-year-old woman with low-grade ductal carcinoma in situ and true-positive findings at MRI (lesion 15).
                                                                                                                                                                                                      A, Magnification mammogram (retroareolar region of left breast) shows 10-mm cluster of amorphous
                                                                                                                                                     MRI Analysis Against Reference Standard          calcifications (arrow). Ultrasound findings were normal. Mammographically guided vacuum-assisted biopsy
                                                                                                                                                        At breast MRI analysis, 116 (68.6%) le-       result was lobular neoplasia.
                                                                                                                                                                                                      B, Axial T1-weighted contrast-enhanced subtracted MR image (TR/TE, 9/4.7; flip angle, 25°) shows nonmasslike
                                                                                                                                                     sions were assessed as negative: 59 (34.9%)      enhancing lesion (arrow) with ductal distribution and inhomogeneous enhancement in retroareolar region of left
                                                                                                                                                     BI-RADS category 1, 12 (7.1%) BI-RADS            breast. Lesion had type 2 signal intensity curve and was classified BI-RADS category 4.

                                                                                                                                                     AJR:198, February 2012                                                                                                                                       275
Linda et al.
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                                                                                                                                                                                                       A                                                         B                                                        C
                                                                                                                                                     Fig. 2—48-year-old woman with radial scar and false-positive MRI findings.
                                                                                                                                                     A, Left craniocaudal mammogram shows area of focal asymmetric density and architectural distortion (arrow) in outer quadrants of breast.
                                                                                                                                                     B, Correlative ultrasound scan shows hypoechoic area (arrow) with irregular shape and margins and posterior acoustic shadowing measuring 20 mm. Sonographically
                                                                                                                                                     guided 14-gauge core needle biopsy result was radial scar.
                                                                                                                                                     C, Coronal T1-weighted contrast-enhanced subtracted MR image (TR/TE, 15/4; flip angle, 7.25° ) shows masslike enhancing lesion (arrow) with irregular shape and margins
                                                                                                                                                     and inhomogeneous enhancement measuring 22 mm in outer quadrants of left breast. Lesion had type 3 signal intensity curve and was classified as BI-RADS category 4.

                                                                                                                                                     loma, radial scar, LN, and ADH were 97.4%                predictive of upgrade to malignancy. All of               pared with LN and ADH (88% and 90%).
                                                                                                                                                     (95% CI, 89–100%; 38/39), 97.6% (95% CI,                 those lesions were enhancing, but we found                Presumably, the variability in likelihood of
                                                                                                                                                     88–100%; 41/42), 88.0% (95% CI, 72–96%;                  that approximately one half of benign high-               malignancy among high-risk lesions may af-
                                                                                                                                                     22/25), and 90.0% (95% CI, 63–99%; 9/10).                risk lesions were not enhancing (classified               fect the usefulness of MRI in prediction of the
                                                                                                                                                     All performance parameters for each high-                BI-RADS category 1). On the other hand,                   presence or absence of malignancy. Papillo-
                                                                                                                                                     risk lesion type are reported in Table 4.                four of 22 high-risk lesions upgraded to ma-              mas and radial scars diagnosed at CNB are
                                                                                                                                                                                                              lignancy (one radial scar, two LN, one ADH)               associated with much lower prevalence of
                                                                                                                                                     Discussion                                               in our series were nonenhancing at MRI. All               malignancy at surgical excision than are LN
                                                                                                                                                        Our data showed that breast MRI can be                these lesions corresponded to small DCIS of               and ADH (6.2% and 3.7% versus 34.3% and
                                                                                                                                                     used to identify high-risk lesions associated            low or intermediate grade (Table 1). It is rea-           25.0% in our study) [2–6]. Because of the low
                                                                                                                                                     with a low likelihood of upgrade to malig-               sonable to believe that absence of enhance-               prevalence of disease, it is not surprising that
                                                                                                                                                     nancy at surgical excision. The overall sen-             ment may be a strong indicator of absence of              MRI had a high negative predictive value in
                                                                                                                                                     sitivity is 72.7%; specificity, 74.8%; positive          invasive carcinoma. Further studies are nec-              these two specific groups [24]. If on the ba-
                                                                                                                                                     predictive value, 30.2%; and negative pre-               essary to clarify this issue.                             sis of low risk of malignancy, all papillomas
                                                                                                                                                     dictive value, 94.8%. These results suggest                 High negative predictive values for malig-             and radial scars with normal MRI findings in
                                                                                                                                                     a possible role for this noninvasive imag-               nancy were found for papilloma without atyp-              our study had been hypothetically addressed
                                                                                                                                                     ing modality in the workup of high-risk le-              ia and radial scar (97.4% and 97.6%), com-                with follow-up [25], 79 unnecessary surgi-
                                                                                                                                                     sions. Despite differences in study methods,
                                                                                                                                                     our findings are similar to those reported in            TABLE 3: Performance of MRI Based on Type of Biopsy
                                                                                                                                                     a retrospective study [19] of 79 lesions eval-                                                                  Biopsy Type
                                                                                                                                                     uated with the Baum-Fisher score [22] and
                                                                                                                                                     in another prospective study [20] of 32 le-                                                  Mammographic                     Ultrasound Core
                                                                                                                                                     sions. The results of both studies confirmed                      Parameter              Vacuum-Assisted Biopsy                Needle Biopsy                p
                                                                                                                                                     that MRI has high negative predictive value               Sensitivity                           62.5 (47–76)                   78.6 (70–85)                0.985
                                                                                                                                                     for malignancy (98.2% and 96%) in the eval-               Specificity                           94.9 (83–99)                    67.6 (58–76)               0.272
                                                                                                                                                     uation of high-risk lesions.
                                                                                                                                                                                                               Positive predictive value             71.4 (56–83)                    23.9 (17–33)               0.196
                                                                                                                                                        Strigel et al. [23] evaluated 39 high-risk
                                                                                                                                                     lesions initially detected with MRI and                   Negative predictive value             92.5 (80–98)                   96.1 (90–99)                0.995
                                                                                                                                                     found no specific morphologic MRI features                Note—Biopsy type values are percentages with 95% CI in parentheses.

                                                                                                                                                     276                                                                                                                                             AJR:198, February 2012
MRI of High-Risk Breast Lesions

                                                                                                                                                     TABLE 4: Overall Performance of MRI
                                                                                                                                                                                                                                   Lesion Type
                                                                                                                                                               Parameter                    Papilloma               Radial Scar          Lobular Neoplasia       Atypical Ductal Hyperplasia           Overall
                                                                                                                                                     Sensitivity                           75.0 (62–85)            50.0 (36–64)             75.0 (57–87)                75.0 (47–92)                72.7 (65–79)
                                                                                                                                                     Specificity                           63.3 (50–75)            78.8 (65–88)             95.7 (81– 99)               75.0 (47– 92)               74.8 (67–81)
                                                                                                                                                     Positive predictive value              12.0 (6–23)             8.3 (3–20)              90.0 (74– 97)               50.0 (25–74)                30.2 (23– 38)
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                                                                                                                                                     Negative predictive value             97.4 (89–100)           97.6 (88–100)            88.0 (72–96)                90.0 (63–99)                94.8 (90–97)
                                                                                                                                                     Note—Data are percentages with 95% CI in parentheses.

                                                                                                                                                     cal procedures would have been avoided, and            27]. On the other hand, low-grade DCIS has a             We propose that women with papilloma
                                                                                                                                                     two false-negative cases (one in each group)           benign biologic profile and if left undetected         without atypia and those with radial scar
                                                                                                                                                     would have been missed. Both these false-              (and untreated), it is likely to remain dormant        with normal MRI findings may safely un-
                                                                                                                                                     negative lesions were found to be low-grade            or to exhibit slow (decades long) progression          dergo clinical and radiologic follow-up. A
                                                                                                                                                     DCIS (4 and 8 mm) at pathologic examina-               to invasive carcinoma [28]. Therefore, diag-           possible interval time for follow-up might be
                                                                                                                                                     tion of the surgical specimen (lesions 1 and           nostic delay due to noninvasive management             every 6 months for 2 years with both con-
                                                                                                                                                     6, Table 1). It has been reported that absence         (imaging follow-up) in our two false-negative          ventional imaging and MRI for prompt rec-
                                                                                                                                                     of enhancement on MR images is observed                cases would probably not have a substantial            ognition of interval onset of contrast en-
                                                                                                                                                     in 20–60% of cases of low-grade DCIS [26,              effect on prognosis.                                   hancement [20]. MRI had an unacceptably

                                                                                                                                                                                                      A                                                      B                                                         C
                                                                                                                                                     Fig. 3—47-year-old woman with sclerosing papilloma and true-negative MRI findings.
                                                                                                                                                     A, Mediolateral oblique mammogram shows low-density oval opacity (arrow) with regular margins in upper retroareolar area of right breast.
                                                                                                                                                     B, Ultrasound scan corresponding to A shows oval hypoechoic nodule with regular margins (calipers) measuring 8 mm. Sonographically guided 14-gauge core needle
                                                                                                                                                     biopsy result was sclerosing papilloma without atypia.
                                                                                                                                                     C, Axial T1-weighted contrast-enhanced subtracted MR image (TR/TE, 9/4.7; flip angle, 25°) shows oval mass (arrow) with smooth margins and homogeneous
                                                                                                                                                     enhancement in upper retroareolar area of right breast. Lesion had type 2 signal intensity curve and was classified BI-RADS category 3.

                                                                                                                                                                                                                                                                             Fig. 4—62-year-old woman with low-
                                                                                                                                                                                                                                                                             grade ductal carcinoma in situ (4 mm) and
                                                                                                                                                                                                                                                                             false-negative findings at MRI (lesion 1).
                                                                                                                                                                                                                                                                             A, Ultrasound scan of left breast shows
                                                                                                                                                                                                                                                                             hypoechoic nodule (arrow) with lobulated
                                                                                                                                                                                                                                                                             shape and slightly irregular margins
                                                                                                                                                                                                                                                                             measuring 11 mm in upper outer quadrant
                                                                                                                                                                                                                                                                             of breast. Mammographic findings were
                                                                                                                                                                                                                                                                             normal. Sonographically guided 14-gauge
                                                                                                                                                                                                                                                                             core needle biopsy result was papilloma
                                                                                                                                                                                                                                                                             without atypia.
                                                                                                                                                                                                                                                                             B, Axial T1-weighted contrast-enhanced
                                                                                                                                                                                                                                                                             subtracted MR image (TR/TE, 9/4; flip
                                                                                                                                                                                                                                                                             angle, 7.25°) shows lobulated mass (arrow)
                                                                                                                                                                                                                                                                             with predominantly regular margins and
                                                                                                                                                                                                                                                                             homogeneous enhancement in upper outer
                                                                                                                                                                                                                                                                             quadrant of left breast. Lesion had type 2
                                                                                                                                                                                                                                                                             signal intensity curve and was classified
                                                                                                                                                                                                                    A                                                   B    BI-RADS 3.

                                                                                                                                                     AJR:198, February 2012                                                                                                                                           277
Linda et al.

                                                                                                                                                     low negative predictive value for malignan-        LN seem not to benefit from MRI, and these                11. Nagi CS, O’Donnell JE, Tismenetsky M, Blei-
                                                                                                                                                     cy in patients with LN and ADH (88% and            lesions should be surgically excised.                         weiss IJ, Jaffer SM. Lobular neoplasia on core
                                                                                                                                                     90%), corresponding to 12% and 10% false-                                                                        needle biopsy does not require excision. Cancer
                                                                                                                                                     negative rates. According to our data, MRI         Acknowledgment                                                2008; 112:2152–2158
                                                                                                                                                     cannot be recommended in the management              We thank Luisa Battigelli, University of                12. Lam WW, Chu WC, Tang AP, Tse G, Ma TK.
                                                                                                                                                     decision process for LN and ADH. These le-         Udine, Italy, for data collection and image                   Role of radiologic features in the management of
                                                                                                                                                     sions should be excised because of the high        preparation.                                                  papillary lesions of the breast. AJR 2006; 186:
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                                                                                                                                                     upgrade rate. Further studies are needed to                                                                      1322–1327
                                                                                                                                                     establish the most appropriate time inter-         References                                                13. Shin HJ, Kim HH, Kim SM, et al. Papillary le-
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                                                                                                                                                     MRI interpretation in this clinical situation          sy from a radiology/pathology perspective. Radi-          breast MR imaging for predicting malignancy of
                                                                                                                                                     was not performed. Fourth, the acquisition             ol Clin North Am 2010; 48:999–1012                        histologically borderline lesions diagnosed at core
                                                                                                                                                     plane of MR images was coronal in the ini-          8. Golub RM, Bennett CL, Stinson T, Venta L, Mor-            needle biopsy: prospective evaluation. Radiology
                                                                                                                                                     tial phase of the study period and in the axial        row M. Cost minimization study of image-guided            2010; 257:653–661
                                                                                                                                                     plane later. However, both imaging planes are          core biopsy versus surgical excisional biopsy for     21. Ikeda DM, Hylton NM, Kuhl CK, et al. BI-RADS:
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                                                                                                                                                     of surgical excision. Patients with ADH and            sion. AJR 2008; 190:637–641                           23. Strigel RM, Eby PR, Demartini WB, et al. Fre-

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MRI of High-Risk Breast Lesions

                                                                                                                                                         quency, upgrade rates, and characteristics of high-        morphological pattern of enhancement. Br J Ra-           frequency and mammographic and pathologic re-
                                                                                                                                                         risk lesions initially identified with breast MRI.         diol 2003; 76:3–12                                       lationships in excisional biopsies guided with
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                                                                                                                                                                            F O R YO U R I N F O R M AT I O N
                                                                                                                                                                            This article has been selected for the new AJR Journal Club activity. The accompanying Journal
                                                                                                                                                                            Club study guide can be found on the following page.

                                                                                                                                                     AJR:198, February 2012                                                                                                                                                  279
Linda et al.

                                                                                                                                                     A PP E N D I X 1 : A J R J o u r n a l C l u b

                                                                                                                                                     Study Guide:
                                                                                                                                                     Nonsurgical Management of High-Risk Lesions Diagnosed at Core
                                                                                                                                                     Needle Biopsy: Can Malignancy Be Ruled Out Safely With Breast MRI?
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                                                                                                                                                     Joseph J. Budovec, Margaret Mulligan, Alan Mautz
                                                                                                                                                     Medical College of Wisconsin, Milwaukee, WI
                                                                                                                                                     jbudovec@mcw.edu, mmulliga@mcw.edu, amautz@mcw.edu

                                                                                                                                                     Introduction
                                                                                                                                                      1. Is the research question clinically relevant? Is the topic timely?
                                                                                                                                                      2. What is the standard practice at your institution for management of high-risk lesions diagnosed at core needle biopsy?
                                                                                                                                                      3. What is the research question being asked? Is a specific hypothesis formulated? How would you write the null and alternative hypotheses?

                                                                                                                                                     Methods
                                                                                                                                                      4. How were patients selected for inclusion in this study? What were the exclusion criteria?
                                                                                                                                                      5. In general, what are the advantages of a prospectively designed study? What are the disadvantages?
                                                                                                                                                      6. How did the authors attempt to limit potential biases?
                                                                                                                                                      7. What was the reference standard to which the imaging results were compared?

                                                                                                                                                     Results
                                                                                                                                                      8. Fifty-five patients were excluded from the study because they declined surgery. How might this influence the authors’ results?
                                                                                                                                                      9. How are positive predictive value and negative predictive value calculated? What is the clinical utility of a high negative predictive value?
                                                                                                                                                     10. The authors noted that papillomas and radial scars diagnosed at core needle biopsy had a high negative predictive value. What may be a
                                                                                                                                                         reason for such findings?

                                                                                                                                                     Physics
                                                                                                                                                     11. Briefly explain how dynamic signal intensity-time curves are created. What is the clinical utility of such curves?

                                                                                                                                                     Discussion
                                                                                                                                                     12. What are the study limitations? How did the authors address the study limitations? How would you design a similar study to overcome
                                                                                                                                                         these limitations?

                                                                                                                                                     Background Reading
                                                                                                                                                       1. Georgian-Smith D, Lawton TJ. Controversies on the management of high-risk lesions at core biopsy from a radiology/pathology perspective. Radiol Clin North Am
                                                                                                                                                          2010; 48:999–1012
                                                                                                                                                       2. Pediconi F, Padula S, Dominelli V, et al. Role of breast MR imaging for predicting malignancy of histologically borderline lesions diagnosed at core needle biopsy:
                                                                                                                                                          prospective evaluation. Radiology 2010; 257:653–661

                                                                                                                                                             F O R YO U R I N F O R M AT I O N
                                                                                                                                                             For more information on Journal Clubs, see “Evidence-Based Radiology A Primer in Reading Scientific Articles” in the
                                                                                                                                                             July 2010 AJR at www.ajronline.org/cgi/content/full/195/1/W1

                                                                                                                                                     *Please note that the authors of the Study Guide are distinct from those of the companion article.

                                                                                                                                                     280                                                                                                                                           AJR:198, February 2012
This article has been cited by:

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                                                                                                                                                         Lowry. 2020. Risk for Upgrade to Malignancy After Breast Core Needle Biopsy Diagnosis of Lobular Neoplasia: A Systematic
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Downloaded from www.ajronline.org by 213.4.31.4 on 01/26/21 from IP address 213.4.31.4. Copyright ARRS. For personal use only; all rights reserved

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                                                                                                                                                      6. Yoav Amitai, Anabel Scaranelo, Tehillah S. Menes, Rachel Fleming, Supriya Kulkarni, Sandeep Ghai, Vivianne Freitas.
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                                                                                                                                                      7. Sheila Boateng, Nikki Tirada, Gauri Khorjekar, Stephanie Richards, Olga Ioffe. 2020. Excision or Observation: The Dilemma
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                                                                                                                                                      8. Alana A. Lewin, Cecilia L. Mercado. 2020. Atypical Ductal Hyperplasia and Lobular Neoplasia: Update and Easing of
                                                                                                                                                         Guidelines. American Journal of Roentgenology 214:2, 265-275. [Abstract] [Full Text] [PDF] [PDF Plus]
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