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在直肠癌保留肛门的诸手术中，对离断端与肿物肉眼界限的距离争论不一。根据我院及外院手术术后复发的39例并结合文献关于直肠癌壁内逆向浸润的研究结果~([1，2])，认为不能绝对地规定一个统一的切断距离，而应视病变不同采用不同的切断距离，减少术后复发。
In various procedures for the rectal cancer to retain the anus, there is a disagreement about the distance from the stump to the naked eye. According to the 39 cases of postoperative recurrence after surgery in our hospital and the external hospital, combined with the literature’s findings on the intramural regressive infiltration of rectal cancer ([1,2]), it is considered that a uniform cut-off distance cannot be absolutely defined, and the lesion should be treated differently. Different cut-off distances were used to reduce postoperative recurrence.