以一个距离肛门6cm的T2的直肠肿瘤为例,施行保肛手术,按照全系膜切除的原则,在盆筋膜脏层和壁层之间锐性将直肠后方游离至盆底肌,然后游离直肠前壁和侧韧带至盆底肌肉,下一步我认为就是将直肠游离至盆底肌以后,从盆底开始沿直肠前壁向侧后方用电刀逆行剥离直肠周围的系膜至肿瘤 To a rectal tumor of 6cm from the anus of the rectum as an example, the implementation of anal sphincter preservation, in accordance with the principle of total mesorectal excision, between the parietal fascia visceral and parietal sharp rear rectum to the pelvic floor muscle, and then free Rectal wall and lateral ligaments to the pelvic floor muscle, the next step I think it is free to the pelvic floor after the rectum, from the pelvic floor along the anterior wall of the rectum along the lateral rear electrotome retrograde dissection of the mesothelium around the rectum to the tumor