Case report of Fibroadenoma in axillary accessory breast

Abstract Introduction Accessory breast tissue, also known as ectopic or supernumerary breast tissue, is a rare developmental anomaly resulting from incomplete regression of the mammary ridge during embryogenesis. Fibroadenoma is a benign tumor commonly arising in breast tissue but is rarely reported in accessory breast tissue. (1) Case report This case report presents a 22-year-old female with a fibroadenoma in a right axillary accessory breast. The diagnosis was accomplished through clinical examination that revealed an accessory breast that contains a lump, ultrasound imaging supported the diagnosis and surgical excision was successfully performed. Discussion Accessory breast tissue arises due to incomplete regression of the embryonic mammary ridge. It may remain asymptomatic or present with cyclical changes, pain, or a palpable mass. Fibroadenomas are rare in accessory breast tissue and pose diagnostic challenges due to their unusual location.