由于肛直肠位置深在，手术均在较狭窄的盆腔内进行，显露较差，手术操作困难。同时近年来各种保肛手术的广泛开展，肛直肠手术的并发症时有发生，但若能早期诊断，恰当处理，预后良好。lff前出血骰前出血是指能前静脉丛或骰椎椎体静脉大出血，是盆腔内大手术的严重并发症，其发 Due to the deep anus and rectum, the surgery was performed in a narrower pelvic cavity, which revealed poor performance and difficult operation. At the same time in recent years, a wide variety of anal sphincter surgery, complications of anorectal surgery have occurred, but if early diagnosis and proper treatment, the prognosis is good. lff before the bleeding hemorrhage before bleeding refers to the hemorrhage can be anterior venous plexus or dorsal vertebral vein bleeding, pelvic major surgery is a serious complication, the hair