Injury to the colon following<unk>  therapy most commonly affecting the sigmoid colon and rectum.
Acute ( up to three months), Chronic ( 3 months to years later)
Results in majority from<unk>  to the lower abdomen and pelvis as in the cases of cancers of the rectum, colon, gonads, uterus, bladder, and prostate.
Radiation proctocolitis
Inflammatory bowel disease
Stercoral colitis
Infectious colitis
CMV colitis
Diversion colitis
Ischemic colitis
Ulcerative colitis