abdominoperineal resection

Abdominoperineal resection of the rectum (AP resection) is a surgical operation to treat usually malignant disease of the rectum or anal canal, and it involves removal of the anus, the rectum, and part of the sigmoid colon along with their draining lymph nodes, through incisions made in the abdomen and perineum. The end of the remaining sigmoid colon is brought out permanently as an opening on the surface of the abdomen, called a colostomy. Fecal matter from the colostomy is collected in a disposable bag that covers the colostomy.
See more at Wikipedia.org...

Surgery to remove the anus, the rectum, and part of the sigmoid colon through an incision made in the abdomen. The end of the intestine is attached to an opening in the surface of the abdomen and body waste is collected in a disposable bag outside of the body. This opening is called a colostomy. Lymph nodes that contain cancer may also be removed during this operation.