Colonic diverticulum perforation: report of two cases as a complication of coronary artery bypass (perforated diverticulum after coronary artery bypass).

Perforation of a sigmoid diverticulum occurred in two patients in the immediate postoperative period after coronary artery surgery. Etiological factors leading to diverticular perforation after coronary artery bypass grafting are discussed. The significance of pneumoperitoneum on the postoperative chest radiograph, which prompted diagnosis in these cases, is also discussed.