Multicentric malignant fibrous histiocytomas of the colon. Report of a case and review of the subject.

Malignant fibrous histiocytoma is a primitive mesenchymal tumor usually found in the soft tissues of the extremity or torso of adults. Only two previous reports of this lesion in the abdominal viscera are present in the world medical literature. A case is reported of three synchronous tumors in the rectum, colon, and omentum with the pathologic appearance of malignant fibrous histiocytoma. Although resected completely with a transverse colocolostomy and a low-anterior resection, the expected behavior of this tumor is one of aggressive local recurrence followed by distant metastasis. The clinical and pathologic characteristics of malignant fibrous histiocytoma are reviewed.