Ulcerative colitis is categorized according to location: • Proctitis involves only the rectum.• Proctosigmoiditis affects the rectum and sigmoid colon.• Left-sided colitis encompasses the entire left side of the large intestine.• Pancolitis inflames the entire colon.
Review Date: 12/22/2010
Reviewed By: Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine,
Harvard Medical School; Physician, Massachusetts General Hospital.
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