国内外学者对低位直肠癌病人肛门括约肌保留问题已作了大量研究,主要围绕以下四个方面进行。一、前切除手术时直肠肿瘤运端应切除的范围根据早期直肠癌病理学研究,Lofgtent、Copeland和Enker等认为,为了清除直肠远端肿瘤扩散,切除肿瘤远端正常肠段应不少于5cm。 Domestic and foreign scholars have done a lot of research on the retention of the anal sphincter in patients with low rectal cancer, mainly around the following four aspects. First, the scope of resection of rectal cancer when the anterior resection operation should be based on the pathological study of early rectal cancer, Lofgtent, Copeland and Enker, etc. believe that in order to remove the distal rectal tumor proliferation, removal of tumor distal normal intestinal segment should not less than 5cm .