A RARE CASE OF ACCESSORY BREAST CANCER OCCURRED IN THE LEFT THORACIC WALL

Ectopic breast cancers are rare and commonly appear in the axillary region. Ectopic breast cancers arised in the thoracic wall have been hardly reported in Japan so far. This is to report a rare case of accessory breast cancer occurred in the left thoracic wall. A 46-year-old woman visited another hospital because she noticed a hard mass in the left lateral thoracic wall, and pointed out having another mass in the anterior chest wall. Extirpation for only the lateral thoracic wall mass was conducted, and the pathological diagnosis of open biopsy was poorly differentiated adenocarcinoma. Inspite of internal and gynecological assessment, we could not find any primary cause. As transferred to our department, we performed an aspiration needle biopsy, and the result was class IV. The patient was operated on with a diagnosis of breast cancer by means of Bt+Ax+Ic. Pathological report showed the accessory breast cancer in the preparation, and the diagnosis of invasive solid-tubular carcinoma was made. The patient has been doing well without any recurrence as of 27months after the operation.