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Malignant fibrous histiocytoma is a type of soft tissue sarcoma that originates from mesenchymal tissues and that mostly affects extremities. Abdominal malignant fibrous histiocytoma usually has a poor prognosis and is rarely seen in the rectum. A 52-year-old female patient presented with rectal bleeding, tenesmus and anemia. She was operated for an obstructive rectal mass and postoperative pathology was reported as malignant fibrous histiocytoma. Herein, we aimed to report a case of malignant fibrous histiocytoma, a rare cause of rectal mass, who was treated with abdominoperineal resection + end colostomy.