女,6个月。1个月开始不明诱因出现尿频、尿急,每0 .5h小便1次。体检:意志清,发育中等。全腹未触及肿块。体温3 7℃,二便化验无特殊。肛门指诊:距肛门上方2cm直肠后壁,骶骨前方可触及一囊性肿物,界不清。腹部平片:盆腔膀胱区可见一6cm×8cm类圆形软组织阴影。IVP(图1) :双肾正常 Female, 6 months. 1 month began to induce urinary frequency, urinary urgency, every 0.5h urine 1 time. Physical examination: will clear, medium development. The whole abdomen did not touch the tumor. Body temperature 37 ℃, two tests no special. Anal fingering: 2cm above the anorectal rectal wall, the sacrum in front of reach a cystic mass, unclear. Abdominal plain film: a 6cm × 8cm class pelvic soft tissue shadow seen in the pelvic area. IVP (Figure 1): kidneys normal