Abstract
Male breast cancer is relatively rare and accounts for 1% of all breast cancers. The frequency of noninvasive ductal carcinoma accounts for 4.8-7.0% among all male breast cancers.
A 65-years-old man visited our hospital with a complaint of abnormal discharge from the left nipple. After 21 months, we noticed induration in the head side of the left nipple. Ultrasonography of the left breast revealed a 7.1×10.0×4.1 mm cystic lesion, associating a solid tumor with hyperechoic spots in the cyst. A fine needle aspiration cytology was performed, and the result was negative. Two months later, the tumor was excised under local anesthesia. Histopathological examination of the tumor revealed noninvasive intracystic carcinoma, which was followed by a simple mastectomy. Immunohistochemically, cancer cells were positive for both estrogen and progesteron receptors. The patient received endocrine therapy with tamoxifen. There have been no signs of recurrence or metastasis to date.
