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原因不明的下消化道出血３９例行数字减影血管造影术（ＤＳＡ）检查，所有患者均作选择性肠系膜上，下动脉及腹腔动脉造影。结果：３９例中发现病变１５例（３８．５％），其中小肠平滑肌瘤４例，小肠平滑肌肉瘤１例，假性动脉瘤１例，动脉瘤１例，血管结构不良５例，炎症性改变２例，腹膜后肿瘤１例。３９例中出血活动期检查６例发现病变５例（８３．３％）。结论：在消化道出血的ＤＳＡ检查中把握造影时机、合理应用数字减影功能、使用超选择插管技术、适当选用药物性血管造影有利于提高诊断的阳性率。
Unidentified lower gastrointestinal bleeding 39 patients underwent digital subtraction angiography (DSA) examination, all patients were made for selective superior mesenteric artery, inferior artery and celiac angiography. Results: Fifteen cases (38.5%) were found in 39 cases, including 4 cases of small intestinal leiomyoma, 1 case of small intestinal leiomyosarcoma, 1 case of pseudoaneurysm, 1 case of aneurysm, 5 cases of vascular malformation, Change in 2 cases, 1 case of retroperitoneal tumor. In 39 cases, 6 cases were found to have lesions (5 cases, 83.3%). Conclusion: DSA in gastrointestinal bleeding to grasp the timing of angiography, the rational use of digital subtraction function, the use of superselective catheterization, the appropriate choice of drug-induced angiography is conducive to improving the diagnostic positive rate.