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©2013 UpToDate ® Print Email Blood vessel within a colonic diverticulum Endoscopy showing a blood vessel within a diverticulum. The blood vessel is separated from the bowel lumen only by mucosa. Over time, the vessel wall is exposed to injury along its luminal aspect, possibly leading to segmental weakness which predisposes to rupture into the lumen. Courtesy of James B McGee, MD. Normal sigmoid colon Endoscopic appearance of the normal sigmoid colonic mucosa. The fine vasculature is easily visible, and the surface is shiny and smooth. The folds are of normal thickness. Courtesy of James B McGee, MD.