[A Case of Sentinel Lymph Node Biopsy for Male Breast Cancer].

The patient, a 57-year-old man, observed an elastic hard tumor under his left areola. Ultrasonography showed a circular hypoechoic mass that was 1.5 cm in diameter with a moderately indistinct border. Using fine needle aspiration cytology, the tumor was diagnosed as a ductal carcinoma(T1N0M0, stage I ). The patient underwent a mastectomy and a sentinel lymph node biopsy. We omitted radical axillary lymph node dissection because there were no metastases in the sentinel lymph node according to intraoperative frozen section diagnosis. On histopathology, the patient was diagnosed with papillotubular carcinoma. The tumor was positive for ER and negative for PgR, and the HER2 score was 2+. Postoperatively, oral tamoxifen therapy was administered. There have been no signs of recurrence during 4 years of follow-up. We report the sentinel lymph node biopsy results for the 27 cases of male breast carcinoma in Japan.