The rectum is sectioned with a mechanical linear stapler at levator muscle level or lower after beginning dissection between the external and internal sphincters. Anastomosis is performed with a circular sta pler inserted with a trans-anal approach according to the technique described by Knight and Griffen . The further rectal section determined by circular stapler in some cases may move the anastomosis level to the dentate line realising a "real" colo-anal anastomosis. The functional results improve by associating a colonic reservoir with anastomosis .
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