Application of the probabilistic approach to reporting breast fine needle aspiration in males

Objective: To apply the probabilistic approach to a series of fine needle aspiration (FNA) samples of male breast lesions and determine the accuracy and reproducibility of this method of reporting in men. Study Design: All male breast surgical specimens with a preoperative breast FNA at our institution from 1994 to 2005 were identified. The FNAs were blindly reviewed by 2 groups of observers and classified in 1 of 5 categories using published reporting guidelines: positive, suspicious, atypical, proliferative without atypia and unremarkable. The histologic and cytologic diagnoses were correlated. The interobserver variation was determined. Results: A total of 138 FNAs were performed for 123 male patients. Histologic correlation was available for 23 satisfactory FNAs. A total of 11 of 11 carcinomas (100%) were classified as positive, suspicious or atypical. Of 12 benign masses, 11 (91.6%) were classified as proliferative without atypia or unremarkable. One case of gynecomastia was classified as atypical by 1 observer but deemed not atypical with consen sus review. The κ statistic for benign and atypical/suspicious/malignant categories was 0.90. Conclusion: Based on this series, the probabilistic approach can be applied to the reporting of FNAs of male breast lesions. Gyneco mastia may result in an atypical cytologic diagnosis.