From 1981 to 1991 inclusive, 188 operations were carried out for diverticular sigmoiditis. One hundred and thirty-nine patients were operated in emergency for acute complications (123) or fistulae (16), and another 49 had surgery scheduled outside acute crisis periods. Mortality and morbidity respectively are 16.5 and 31% in the first group, against 0 and 12% in the second one. Similarly, the stay in hospital varies from 13 days for scheduled surgery to 23 days for emergent surgery, the latter also requiring to account for risks and for the duration of a second operation that is far from exceptional (40%). Considering the severity of some evolutive complications, the authors advocate early radical surgery for symptomatic diverticular sigmoiditis, after the second crisis or as soon as the first one if it has been severe, and in young subjects and patients at risks.