[Desmoid tumor in a male breast in the context of Gardner's syndrome. Case report].

Fibromatosis (Desmoid tumor) of the male breast is an exceptional location. We present a case of such a tumor, in the context of Gardner's syndrome. A palpable mass was discovered in the right breast of a 52 years old man, with a history of rectocolic adenomatous polyposis. Mammography ant thoracic CT scan showed a stellar tumor, mimicking a breast cancer. Treatment consisted of wide excision and histology revealed a desmoid tumor. Desmoid tumors of the breast are benign lesions; they should be widely excised because of a high risk of recurrence. Coloscopy is indicated in the presence of mammary fibromatosis, to look for associated multiple polyps, confirming the diagnosis of Gardner's syndrome.