Angiodysplasia of the colon is an important cause of lower GI bleeding.With increase popularity of the colonoscopic examination, more of this hind vascular lesion was detected.

• 摘要大肠血管形成异常是下消化道出血的一个重要原因，在大肠镜检查日益普及的今天，愈来愈多这类血管病变发现。