A case of advanced accessory breast cancer effectively treated with trastuzumab and paclitaxel]

A 53-year-old woman was admitted for left axillary mass. The computed tomography showed an invasive mass in the left axilla and left supraclavicular lymph node swelling. Histological findings of axillary mass revealed infiltrating ductal carcinoma of scirrhous type. We diagnosed advanced accessory breast cancer, and the patient was treated by combination chemotherapy with paclitaxel and trastuzumab. The lesions disappeared after 4 courses of chemotherapy and was clinically diagnosed as complete response (CR).