There are ethnical differences. In western countries the main cause is a diet deficient in fiber.
Typical localization is the sigma, but the right- sided colon and cecum can also be affected.
Typical picture of stool retention in a diverticula. Retained stool is a local irritant to the intestinal wall and favours bacterial over- growth, thus potentially leading to diverticulitis. To prevent perforation the endoscopist must be careful to discriminate a diverticula from the proper intestinal lumen. The mucous membrane around the diverticulosis is erythematous, vessels are rarified. Conservative therapy achieved complete remission of the diverticulitis and dilatation of the stenosis.