American Journal of Roentgenology, Vol 171, 1671-1678, Copyright © 1998 by American Roentgen Ray Society

ARTICLES

Predictive value of specimen radiography for core needle biopsy of noncalcified breast masses

WA Berg, B Jaeger, C Campassi and D Kumar
Department of Radiology, University of Maryland School of Medicine, Baltimore 21201, USA.

OBJECTIVE: Our objective was to determine the predictive value of specimen radiography for large core (14-gauge) needle biopsy of noncalcified breast masses. SUBJECTS AND METHODS: Eighty-four biopsies of 83 breast masses yielded 403 specimens. Specimens showing dense material on specimen radiography were predicted to be diagnostic; specimens showing intermediate- or low-density material were predicted to be nondiagnostic. Specimen radiographic and histopathologic findings were correlated for each specimen using vital dyes to mark individual specimens. RESULTS: Of the 403 specimens, 307 (76%) contained diagnostic material representative of the lesion, with a specific diagnosis achieved for 82 (99%) of 83 lesions (62 benign, 20 malignant). Of the 293 passes containing dense material, 268 (91%) proved to be diagnostic; 11 (18%) of 62 specimens containing only low- density material proved to be diagnostic. Of the 25 (9%) of 293 specimens containing radiographically dense but nondiagnostic material, 18 (72%) showed focal fibrosis and had missed the lesion; 15 (83%) of 18 such specimens were obtained in dense parenchyma. The positive predictive value of specimen radiography was 13 (100%) of 13 in fatty breasts; 77 (96%) of 80 in breasts with minimal scattered fibroglandular elements; 91 (94%) of 97 in heterogeneously dense breasts; and 35 (70%) of 50 in breasts with extremely dense parenchyma. Of the 16 lesions sampled stereotactically, specimen radiography helped assess the inadequacy of initial sampling in three (19%). In six (9%) of 68 sonographically guided biopsies, only one or two specimens could be obtained; specimen radiography helped us predict whether material was adequate for diagnosis. CONCLUSION: Radiography of core specimens obtained from noncalcified breast masses accurately reveals the adequacy of sampling unless the breast parenchyma is extremely dense. Such immediate assessment can help ensure adequate material from lesions that are difficult to biopsy and can thereby improve the diagnostic yield of large core needle breast biopsy.
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