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Radiology, Vol 198, 319-322, Copyright © 1996 by Radiological Society of North America

ARTICLES

Mammographically detected breast lesions: clinical importance of cytologic atypia in stereotaxic fine-needle aspiration biopsy samples

JS Mitnick, MF Vazquez, HD Feiner, P Pressman and DF Roses
Murray Hill Radiology and Mammography, New York, NY 10016, USA.

PURPOSE: To correlate cytologic findings of stereotaxic fine-needle aspiration biopsy samples with histologic findings of excised samples of nonpalpable mammographically detected lesions. MATERIALS AND METHODS: In a retrospective review of 2,988 consecutive stereotaxic fine-needle aspiration biopsy samples of nonpalpable breast lesions obtained within 5 years, 70 samples were categorized as atypical. Excision with needle localization and specimen radiography were performed in all lesions; cytologic findings of aspirates were correlated with histologic findings of excised samples. Histologic findings were the standard of reference. RESULTS: Of the 70 atypical aspirates, 27 were benign (38%) and 43 were malignant (61%). Both the benign and the malignant lesions had an average size at mammography of 1.1 cm. The nuclear grade was low in 21 (49%), moderate in 16 (37%), and high in six (14%) of the malignant lesions. There were axillary lymph node metastases in four samples (9%). CONCLUSION: Although lesions with atypical aspirates usually are benign, to achieve a low prevalence of false-negative diagnoses atypia must be interpreted as potential malignancy.


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