Chicken-bone perforation of a sigmoid colon diverticulum into the right groin and subsequent phlegmonous inflammation of the abdominal wall.

Colonic diverticula are frequent in western countries and approximately 80% of patients who develop diverticulitis are elderly. The sigmoid and descending colon are most commonly involved. Clinical manifestations range from asymptomatic diverticula to life-threatening complications such as diverticulum perforation and subsequent peritonitis.