ABS TRACT Desmoid fibromatosis is an uncommon fibroproliferative condition and classified as an intermediate tumor because of low metastatic potential and risk of mortality. In this article, we present a rare condition with desmoid fibromatosis mimicking breast cancer in a 52 years old patient after nipple-sparing mastectomy. A 52-year old multiparous patient referred to the outpatient clinic due to gradually growing mass on the outer quadrant of her right breast. A core needle biopsy was

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... med and invasive ductal carcinoma was revealed. We did therapeutic mastectomy to the right and contralateral prophylactic mastectomy to the left breast. After one-year follow-up period, the patient applied to our clinic because of a palpable mass on the inferior quadrant of her right breast and chest pain while breathing. Gross pathology results showed a 5.5x1x0.4 cm tumor. Microscopic identification of the lesion showed a nonencapsulated mass with fibrous, gray and white nodular parenchyma. The diagnosis was desmoid type fibromatosis. When desmoid tumor occurs in the chest wall, especially after conservative breast surgery operations, these tumors may resemble the recurrent breast cancer.