Abstract
The present case was a 67-year-old woman. The patient had operations for metachronous cancer of the bilateral breast at the age of 56 and 62 years. After the oncostatic chemotherapy was completed, the patient did not receive endocrine therapy because both breast cancers were negative for hormone receptors. During the observation, the patient was identified with a right axillar tumor, that was flat shaped, measuring 15 mm in diameter, and having a clear border. The axillary mass was first diagnosed as a possible local recurrence of breast cancer by fine needle cytological examination. Finally, accessory breast cancer was confirmed by pathological examination after the operation. Characteristic microscopic features of neuroendocrine carcinoma were observed histologically.
We reported the case with some of the literature, because accessory breast cancer after mastectomy for bilateral breast cancer is extremely rare.
