Abstract
A case of intracystic accessory breast cancer associated with contralateral non-infiltrating breast cancer which is exceptionally encountered is described. A 57-year-old woman was admitted to the hospital because of a left axillary tumor. No breast tumors were palpable and there were no significant findings on mammography. But ultrasonography revealed a right breast tumor. Excisonal biopsies of the left axillary tumor and right breast tumor were performed. Histological findings revealed that the left axillary tumor was intracystic papillary adenocarcinoma of the accessory mammary gland and the right breast tumor was non-infiltrating ductal carcinoma. A wide local resection with left axillary lymph node dissection and a right radical mastectomy were carried out. No other cancerous lesions including lymph node metastasis and infiltrating cancer of the breast were found. She is doing well without any evidence of recurrence, as of one year after the operation.
