患者女，32岁.2个月前无诱因排便时及便后肛门不适，仍有便意。1个半月前因早孕人流后上述症状仍存在，无脓血便。4年前妊娠足月不能自产，剖腹产时发现盆腔肿物影响胎儿入盆，因无症状未手术。体检未发现异常。肛门指诊：肛门无异常，于膝胸卧位2点处可摸到囊性肿物，上界不清 Female patient, 32 years old. There was no incentive to defecation and defecation anal 2 months ago, there is still meaning. 1 and a half months before the abortion due to the above symptoms are still present, no abscesses and blood. 4 years ago, pregnancy can not produce full-term pregnancy, cesarean section found that pelvic masses affect the fetus into the basin, due to asymptomatic non-surgical. Physical examination found no abnormalities. Anus Thumbnail: Anus without exception, in the knee chest position 2:00 can be touched Cystic mass, unclear upper bound