Please--what is abdominoperineal resection?

Rectal surgery. An abdominoperineal resection (apr), is surgical removal of the rectum for cancer that involves the distal third of the rectum or anus. Apr involves removal of the anus, the rectum and part of the sigmoid colon along with lymph nodes, through incisions made in the abdomen and perineum. The end of the remaining sigmoid colon is brought out permanently as a colostomy, which drains to a bag.