Abstract
Apocrine adenocarcinoma arising in the accessory breast is extremely rare. We report a case of apocrine adenocarcinoma of the accessory breast. A 63-year-old woman diagnosed as having adenocarcinoma of the right axilla after biopsy was referred to our department of surgery. We regarded it as metastasis from an occult breast cancer or a tumor of unknown origin. Further examinations did not identify the primary cancer lesion. Extended local excision and lymph node dissection were performed. On pathological examination, apocrine adenocarcioma and tissue of the accessory breast were identified, but no communication with the lateral area of the left breast was found. Consequently apocrine adenocarcinoma of the accessory breast was diagnosed. Metastasis was not found in dissected lymph nodes. The patient has been recurrence free for 2 years, to date since the operation.
