[例1]患者男,68岁。1994年1月14日因黑便3月收入我院,既往有慢性出血,近期血色素为74g/L。腹部体检发现脐旁腹壁下肿块,余无阳性体征。胃镜检查见大弯侧3cm×4cm隆起病变,表面粘膜光滑,结肠镜检查无阳性发现。纤维小肠镜检查,当纤维镜进入110cm时发现小肠腔狭窄,并有一个2cm×3 [Example 1] The patient was male, 68 years old. On January 14, 1994, he was admitted to our hospital for March and had chronic hemorrhage. The hemoglobin was 74g/L recently. Abdominal physical examination revealed a submucous mass around the umbilicus, with no positive signs. Gastroscopic examination showed 3cm x 4cm bulge lesions on the side of the curve, smooth surface mucosa, and no positive colonoscopy findings. Fiber enteroscopy, when the fiberscope enters 110cm, it is found that the small intestine cavity is narrow and there is a 2cm×3