Abstract
A 68-year-old woman was admitted to the hospital because of a fist-sized abdominal tumor which was detected at a medical check up. On physical examination, the tumor was elastic hard, uneven, and slightly movable. Abdominal CT and magnetic resonance imaging (MRI) revealed a solid tumor in her left lower quadrant, a part of which was enhanced. Barium enema study revealed no abnormal findings. Original site was obscure, but an operation was performed with a diagnosis of intraperitoneal tumor. During surgery, the tumor locating in the mesosigmoid was found. The tumor extirpation with a partial resection of the sigmoid colon was performed. Extirpatd tumor was 76×55×48mm in size. It was diagnosed as mesosigmoid leiomyosarcoma histopathologically. The patient has been doing well for about 3 years after the operation. Mesenteric leiomyosarcomas are rare, especially mesosigmoid leiomyosarcoma. There have been 52 cases of mesenteric leiomyosarcoma versus 10 cases of mesosigmoid leiomysarcoma including this case in this country. This disease does not respond to chemotherapy and radiotherapy. We think that aggressive surgical extirpation of the primary or recurrent leiomyosarcoma would contribute to improve the prognosis of this disease.
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