Leiomyosarcoma of the transverse colon.

A case report of leiomyosarcoma of the transverse colon was presented in view of its rarity of the occurrence. An extra-colonic, mobile abdominal mass showing a rapid growth with mild tenderness was the principal preoperative findings in the patient. The occurrence of malignant tumors in smooth muscles of the colon, not including the rectum, is extremely rare. In review of the references, about thirty cases have been previously reported.