本文报告5例经手术(4例)或尸解(1例)证实的原发性小肠恶性肿瘤.其中男3例,女2例;年龄40～46岁。主要症状:腹部稳痛,腹胀,黑便,消瘦;仅1例下腹部扪到包块。纤维内镜及钡剂造影多示胃肠道正常,2例B超检查发现腹腔有实质性包块.有4例作了肿瘤段小肠切除、吻合术,1例因消化道大出血死亡,尸解为十二指肠下 This article reports 5 cases of primary malignant tumors of the small intestine confirmed by surgery (4 cases) or autopsy (1 case). 3 males and 2 females; aged 40 to 46 years old. The main symptoms: abdominal pain, bloating, black stools, weight loss; only 1 case of abdominal mass to the mass. Fibrous endoscopy and barium angiography showed that the gastrointestinal tract was normal. Two cases of B-ultrasound revealed a substantial mass in the abdomen. There were 4 cases of small bowel resection and anastomosis, and 1 case died of digestive tract bleeding. For the duodenum