PRIMARY INVASIVE DUCTAL CARCINOMA OF AXILLARY ACCESSORY BREAST

Abstract

Primary accessory breast cancer is an extremely rare pathology, representing less than 1% of all breast cancers, and it is
found in more than 90% of cases in the axilla. The diagnosis of accessory axillary breast cancer (AABC) is often late and
at an advanced stage, with an average delay of 40.5 months. Histological sampling and immunohistochemical results confirm the diagnosis. Most patients are diagnosed with stage II disease or higher, so it is considered to have a poor prognosis. There is no proper management for AABC; it follows the guidelines for orthotopic pectoral breast cancer. We therefore
report the case of a 50-year-old woman diagnosed with grade II invasive ductal carcinoma found in accessory axillary
breast, treated with neoadjuvant chemotherapy followed by a wide local resection and axillary lymph node dissection.