Axillary supernumerary breast in a female adolescent: report of one case.

Polythelia and polymastia usually occur along the embryonic milk lines extending from the axilla to the groin. Polymastia in female patients has been reported to manifest during pregnancy or lactation. We report a 14-year-old adolescent with axillary supernumerary breasts. She had painful axillary swelling during menstrual period. The mass in the right axilla was excised with pathologic report of supernumerary breasts with fibrocystic change. When a mass is located along the milk line, the possibility of the presence of breast tissue should be considered.