小肠出血相对少见，诊断困难，常被误诊；而伴不同病变的小肠肿瘤性出血更易漏诊，本文报告２例，以引起重视。１病例报告例１．男，３６例。因反复黑便伴昏厥１周入院。经胃镜、结肠镜和小肠钡灌造影术均未发现异常。选择性肠系膜上动脉造影术诊断为回结肠末梢血管畸形。... Intestinal hemorrhage is relatively rare, difficult to diagnose, often misdiagnosed; and small intestine tumor hemorrhage with different lesions is more likely to miss diagnosis, this article reports 2 cases, to pay attention. 1 Case report example 1. Male, 36 cases. Due to repeated black stools with fainting for 1 week admission. No abnormalities were found by gastroscopy, colonoscopy, and bowel irrigation. Selective superior mesenteric artery angiography was diagnosed as a vascular malformation of the distal colon. ...