Perforated sigmoid diverticulitis and their abscesses often resolve spontaneously. However, large or unresolving abscesses may require percutaneous drainage under ultrasound or CT guidance. Perforation of a diverticular abscess into the peritoneal cavity will result in purulent peritonitis with localized tenderness becoming generalised peritonism.
The localized inflammatory process associated with a diverticulum may perforate through another epithelial surface to form a fistula. The commonest type of fistula associated with diverticular disease is a colovesical fistula resulting from
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