Background

Supernumerary breasts or polymastia is a moderately common congenital condition of abnormal accessory breast tissue in addition to normal breast tissue. Between 1% and 5% of men and women have this condition. the most common site for accessory nipples is just below the normal breast, and the most common site for accessory breast tissue is the lower axilla. This condition reacts as normal breast tissue, and present the same diseases as a normal breast, need to be followed up for diseases, as in a normal breast. The diagnosis is often discovered incidentally and the management of these condition is essentially surgical and recommended at any age found. We present a rare case of bilateral axillary supernumerary breasts in a 26-year-old woman who had a chronic bilateral axillary lymphadenopathy developing since puberty and worsening with pregnancy and lactation, which strongly reinforces the diagnosis. Underwent excision surgery and the anatomopathological study confirmed the diagnosis of supernumerary breasts with absence tumor cells. Through this case report we will describe the pathological and management aspects of polymastia as rare diagnosis.

Keywords: Supernumerary breast; Adenopathies; Polymastia