Primary Breast Carcinoma in Accessory Axillary Breast Tissue: A Case Report

Accessory axillary breast carcinoma is unusual, with an incidence of 0.2 to 0.6%. It is commonly located in the axilla; however, it may be seen anywhere along the milk line. Development is hormone-dependent, similar to normal breast tissue. Here, a 65-year-old postmenopausal multiparous woman presented at the Surgery Outpatient Department (OPD) with a complaint of a lump in her left axilla with multiple overlying skin ulcers for the past four months. A routine bilateral mammogram was performed, which showed a well-defined hypoechoic area measuring 1.2×1.0 cm with no lymph nodes and calcification over the left accessory breast tissue. A wedge biopsy of the lesion revealed Invasive Ductal Carcinoma (IDC). She underwent a left modified radical mastectomy with an extended incision to the left axilla. She also received neoadjuvant chemotherapy with close follow-up. Recent studies suggest that there is no additional advantage with mastectomy over total excision of accessory breast tissue. Axillary clearance is performed if preoperative lymph node biopsy is positive. Early diagnosis and differentiation of accessory breast cancer are the keys to the effective management of the cancer