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.
Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Senior Physician, Massachusetts General Hospital.
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