The anus can be preserved in most cases when the rectal digital examination is 8cm. Is the mass anterior or posterior? The posterior wall, if the tumor is not fixed, can be pushed, and there is no problem in keeping the anus. The front wall depends on the situation in Shuanghe Town. If the vaginal wall is involved, partial vaginal resection may be needed, but it will not affect anus preservation. Women, especially those who have given birth to children, have a wider pelvis and are more likely to keep anus than men in most cases. It's best to do an MRI to see the depth of the tumor.