[A Case of Male Mammary' Paget's Disease].

A 90-year-old male visited our hospital because redness of his left chest. An erythema of 25 mm in size with indistinct border was observed on the left nipple, and mammary' Paget's disease was diagnosed with a skin biopsy. Ultrasound examination revealed no significant findings in the mammary gland, so a left mastectomy was performed under local anesthesia. The final pathological diagnosis was mammary' Paget's disease with noninvasive ductal carcinoma in the duct. We have experienced a very rare male mammary' Paget's disease because both male breast cancer and mammary' Paget's disease are rare.