In principle, more than 5 cm can preserve anus, and less than 5 cm is not recommended. The risk of operation is not great, but any operation has certain risks, and the cost is about 10 thousand yuan. The classic chemotherapy regimen "oxaliplatin+fluorouracil/calcium folate" is needed after operation. If the gallbladder is inflamed or cholecystitis recurs, it can also be surgically removed. But we should pay attention to the possibility of cancer cell implantation, and we can do gallbladder first and then rectum. If there is no discomfort, there is no need.