Surgery can be needed if a diverticulum bursts or you've had more than 2 attacks of diverticulitis. This is because each episode is usually more severe than the last one. Your surgeon may perform a procedure called a colonic resection-removing the affected part of your bowel and then joining the healthy areas together. Or, after the affected area has been removed, part of your bowel may be brought through an opening in your abdomen so that your bowel contents can be collected in a pouch(colostomy)It gives your bowel a chance to rest and heal. Your bowel is usually then rejoined in another operation some weeks later.
Attribution: BUPA