Adenoid cystic carcinoma of the breast arising in a lipoma mimicking hamartoma: Imaging manifestations and review of the literature

Adenoid cystic carcinoma of the breast is a rare neoplasm and only a few articles have described the imaging findings of the disease. We report a 52-year-old woman who presented with a palpable mass beneath the left nipple. Ultrasound revealed a well-defined, lobulated, hypoechoic mass. Mammography demonstrated a radiopaque mass in a well-defined fat-containing lesion, suggestive of hamartoma. The patient underwent surgery due to enlargement of the tumor. The final diagnosis disclosed adenoid cystic carcinoma arising in a lipoma. The unique imaging findings have never been reported in literature.