1病例报告例1：女，22岁。2岁时发现无痛性大便后滴血，血鲜，量少，不与大便相混，未做特殊治疗，20年来间断（多于大便于结时）出现上述症状，多家医院就医曾按“结肠溃疡、息肉、痔、肛疾”等治疗，症状缓解。近半年来，血便领繁星大，且伴头晕、心悸、乏力、困倦等。查体： Case report 1: Female, 22 years old. 2 years of age found no pain after stool drip, blood, less, not mixed with stool, no special treatment, 20 years of intermittent (more than when the stool at the time of the above symptoms, many hospitals had press “Colon ulcer, polyps, hemorrhoids, anal disease” and other treatment, the symptoms ease. Nearly six months, bloody stare led to large, and with dizziness, palpitations, fatigue, sleepiness and so on. Physical examination: