Pathogenesis of a diverticular bleeding. The colonic diverticulum which appears to form as a herniation of intestinal mucosa through defect in the colonic wall where penetration of arterioles (vasa recta) occurs. This places the vasa recta adjacent to the neck of the diverticulum. Trauma the scraping of intestinal contents against the neck and dome of a diverticulum, led to repeated damage of its associated vasa recta with weakening and predisposition to rupture and massive bleeding.
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