胃肠道平滑肌肉瘤(( leiomyosarcoma) 约占胃肠道恶性肿瘤的2%～3% .其中胃的平滑肌肉瘤最多见,小肠次之,结直肠最少.胃的平滑肌肉瘤好发于近端胃,且发生于胃大弯较小弯为多.小肠中空肠近段最好发,十二指肠次之,空肠远段和回肠较少.结直肠中以直肠发生为多,结肠较少见.一、病理 Gastrointestinal leiomyosarcoma (leiomyosarcoma) accounts for about 2% to 3% of gastrointestinal malignancies, of which the most common form of gastric leiomyosarcoma, followed by the small intestine, the least colorectal. Gastric leiomyosarcoma occurs in the proximal stomach, And occurred in the greater curvature of the lesser curvature of the stomach more proximal jejunum hair, duodenum followed by the distal jejunum and ileum less colorectal rectal as much colon less common. First, the pathology