Extra abdominal mammary fibromatosis (Desmoid tumor) of breast in an elderly female.

The extra-abdominal form of desmoid tumor is very rare and the incidence of mammary desmoid tumor is <0.2% of primary breast neoplasm. We report a case of mammary fibromatosis in an elderly female in which no associated risk factor was discernible. After simple mastectomy as per the patient’s wish, in view of posterior margin positivity, adjuvant radiotherapy was given. The patient has remained recurrence free after one year of follow up.