History and Objectives: Gynecomasty and ectopic breast are disorders of breast. Due to difficulties in the biopsy diagnosis and different reports on sensitivity of FNA test for diagnosis of gynecomasty and ectopic breast and in order to identify the sensitivity of FNA test, the present study was carried out on patients referred to surgical clinic of Kashan Shaheed Beheshti hospital for clinical diagnosis of gynecomasty and ectopic breast.

Materials and Methods: A descriptive study was conducted on patients with clinical diagnosis of gynecomasty and ectopic breast. FNA test was performed before the surgical operation to remove the mass (Biopsy). The outcome of the 2 tests was compared and the positive cases of FNA in gynecomasty and ectopic breast were identified.

Results: From total of 20 patients, 9 with the mean age of 27.1±11 years had axillary mass with ectopic breast and 11 cases (Mean age of 28.9±9.5 years) had gynecomasty. The rate of positive FNA test was 33.3% for ectopic breast and 54.5% for gynecomasty.

Conclusion: It seems that FNA test for the positive diagnosis of gynecomasty and ectopic breast is less sensitive therefore further research is need.