1　病历简介病人男 ,3 4岁。因渐进性排便困难 3个月入院。问诊及一般查体均无阳性记载。肛门指检于直肠前壁扪及质韧肿块。肿块下缘距肛缘 4cm ,上缘不可及。B超探及盆腔见一 10 7mm× 85mm的囊性包块 ,其内可见一 5 6mm×40mm的略增强回声团块。术中探查见肿块位于腹膜返折下 1 medical records patient male, 34 years old. Due to progressive defecation 3 months admitted to hospital. No physical examination and general physical examination records. Anal refers to the anterior rectal palpable mass toughness mass. Lower edge of the tumor from anal edge 4cm, the upper edge of the reach. B ultrasonography and pelvic see a 10 7mm × 85mm cystic mass, which shows a slightly enhanced echo mass of 56mm × 40mm. Intraoperative exploration to see the tumor located in the peritoneal fold under