Suggestion: We must pay attention to the problem of anus preservation in rectal cancer. You mentioned the problem of anus preservation for rectal cancer, and I will answer it for you as follows. (1) 3.5cm, an awkward distance, because 3.5cm into the anus means less than 2cm from the dentate line! Radical surgery in principle requires a certain distance from the tumor, and the rectum is about 2cm, so radical surgery will cut 3.5cm from the anus, so it is difficult to keep the anus. If it is, it is not an absolute radical surgery. And because it is too close to the anus, even if the anus is barely kept, the anus is just a decoration and has no function of sleeping stool. Moreover, because of staples, patients always defecate and their quality of life is not much better. Moreover, there are many perioperative complications, and the most important thing is that intestinal fistula is more likely to occur. So it's hard to keep the anus.
(2) But what if the anus is not preserved? First of all, you mentioned the problem of "it's inconvenient to hang a bag around your waist after shunt", and besides, can the patient be 7 1 year-old, and can he stand Millay's operation? And what you said about "anal reconstruction surgery" I find it hard for old people to bear. If the patient is a young man aged 40-50, I think it can be considered.