目的:分析原发性小肠肿瘤误诊原因.方法:对31例原发性小肠肿瘤进行回顾性分析.结果:31例原发性小肠肿瘤,发现腺癌11例、粘液癌3例、未分化癌1例、平滑肌肉瘤4例、类癌2例、淋巴瘤2例和良性肿瘤8例.结论:原发性小肠肿瘤误诊主要与症状和体征不特异、缺乏特异检查方法有关. OBJECTIVE: To analyze the causes of misdiagnosis of primary small bowel tumors. Methods: A retrospective analysis was performed on 31 cases of primary small bowel tumors. Results: 31 cases of primary small bowel neoplasms. 11 cases of adenocarcinoma, 3 cases of mucinous carcinoma, and undifferentiated carcinoma were found. There were 1 case, 4 cases of leiomyosarcoma, 2 cases of carcinoid, 2 cases of lymphoma, and 8 cases of benign tumor. Conclusions: The misdiagnosis of primary small intestine tumors is mainly related to the non-specific symptoms and signs and lack of specific examination methods.