Macroscopic Features of Ulcerative Colitis with Low, Moderate, and Severe Activities

Ulcerative colitis is a disease that is often encountered by endoscopists. Although endoscopic features of acute self-limiting infectious colitis overlap considerably with those of idiopathic inflammatory bowel disease, there are inflammatory changes and patterns that are suggestive of ulcerative colitis. Three cases are presented with the typical endoscopic features of ulcerative colitis with low, moderate, and severe activities. This article is part of an expert video encyclopedia.