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Twenty-five percent of patients undergoing surgery for acute complicated diverticulitis represent emergencies. This condition is currently treated by colonic resection with primary anastomosis with or without colostomy, or by a Hartmann operation. We report on our experience with 52 consecutive patients with generalized peritonitis (8 cases), peri- and paracolonic abscesses (19 cases), severe pelvic abscesses (12 cases) and multiple abscesses with visceral fistulas (13 cases). All patients had emergency surgery. In 50/52 patients (96.2%) we performed a colonic resection with primary anastomosis using a mechanical stapler and in 2/52 a Hartmann operation. The overall mortality rate was 5.8%. The morbidity rate was 22% with 9 anastomotic leakages. A diverting colostomy was constructed in 16 patients and opened in only 8 patients. In 4 cases a parastomal hernia occurred after late closure and reduction of the colostomy. This data suggest that colonic resection with primary anastomosis, even without colostomy, is a safe procedure for the emergency treatment of acute complicated diverticulitis.