[A Case of Apocrine Carcinoma in the Breast That Was Difficult to Distinguish from Axillary Apocrine Adenocarcinoma].

An 86-year-old woman visited our hospital with a tumor on her right axilla. Ultrasonography(US)showed a 4 cm tumor between mammary gland and axilla with swelling of some lymph nodes. No distant metastatic lesions were found. The pathological findings revealed breast apocrine carcinoma; therefore, we performed total mastectomy and axillary lymph node dissection. The postoperative pathological findings revealed breast apocrine carcinoma with pT4N2M0, Stage Ⅲb(ER positive, PgR negative, HER2 positive, Ki-67 6%). We present a case of breast apocrine carcinoma confused with axially apocrine adenocarcinoma during the diagnosis and report the relevant literature.