Endoscopic findings in ulcerative colitis. Endoscopy in UC typically reveals the following findings: Erythema Loss of the usual fine vascular pattern Granularity of the mucosa Friability Edema. The granular appearance is manifested by changes in light reflection during colonoscopy. Instead of reflecting light in large patches, the granular mucosa reflects a multitude of small points of light, giving the appearance of "wet sandpaper" In contrast to Crohn's disease, lower endoscopy in ulcerative colitis shows continuous and circumferential involvement, with no normal areas of mucosa.
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