小肠是消化道最长的一部分,成人全长平均约5~7米,是食物消化、吸收的主要场所,同时它还具有内分泌和免疫防御功能。但由于小肠走向迂回重叠,而且远离口腔和肛门,给小肠疾病的诊断带来很大难度。一些不明原因消化道出血的患者虽经反复检查仍不能明确诊断,反复出血、住院和输血治 Small intestine is the longest part of the digestive tract, adult average length of about 5 to 7 meters, is the main place for food digestion and absorption, while it also has endocrine and immune defenses. However, due to the small intestine roundabout overlap, but also away from the mouth and anus, to the diagnosis of small bowel disease brought great difficulty. Although some patients with unexplained gastrointestinal bleeding after repeated inspections still can not be a clear diagnosis, repeated bleeding, hospitalization and blood transfusion