Abstract
We report a case of intracystic male breast carcinoma. A 71-year-old man seen for a left breast mass was found in ultrasonography (US) to have a cystic tumor with a solid component measured 5cm in diameter. Fluid aspirated from the cyst was bloody and diagnosed cytologically as invasive ductal carcinoma, necessitating modified radical mastectomy with regional lymph node dissection. Histologically, papillo-tubular invasive ductal carcinoma was observed without lymph node metastasis. The patient's postoperative course was uneventful and he remains recurrence-free 9 months after surgery.
