在直肠癌保留肛门括约肌的各种手术中,低位前切除或超低位前切除保留肛门术效果最佳且应用最广。但在这种手术中,远端肛管直肠保留的长度一直是国内外作者争论的问题。因为远端肛管保留越长,越易吻合,肛门括约肌功能越完好。但越无根据地保留长度,就距肿瘤越近,势必导致保留的? In various procedures for rectal cancer retaining the anal sphincter, anterior or lower anterior resection of preserved anus is best and most widely used. However, in this type of surgery, the length of distal rectal anorectal remains an issue that has been debated by authors at home and abroad. Because the longer the distal anal canal remains, the easier it is to make an anastomosis, the better the function of the anal sphincter. But the more baseless the length is, the closer it is to the tumor, which will inevitably lead to reservations.