分析和探讨全组临床特点及诊断治疗。结果:病灶位于十二指肠5例,空肠11例,回肠12例。以平滑肌肉瘤及腺癌居多。常见为腹痛、贫血、便血、恶心、呕吐、腹泻、体重下降等。术前确诊仅5例,占17.9%。术中发现转移率78.6%。认为原发性小肠恶性肿瘤早期症状不典型,缺乏 Analysis and discussion of the whole group of clinical features and diagnosis and treatment. Results: The lesions were located in 5 cases of duodenum, 11 cases of jejunum, and 12 cases of ileum. Mostly leiomyosarcoma and adenocarcinoma. Common abdominal pain, anemia, blood in the stool, nausea, vomiting, diarrhea, weight loss and so on. Only 5 cases were diagnosed before surgery, accounting for 17.9%. The rate of metastasis was 78.6%. It is considered that the early symptoms of primary malignant small intestine are not typical and lack