The treatment of colorectal obstructions is a surgical problem. The surgeon can choose between primary resection with anastomosis and the staged operations. The one stage procedures need colon decompression or intraoperative colonic lavage. In our experience between 1990 and 1993, 23 patients required an emergency intervention for colon obstruction; between them 13 patients were affected by a left colonic obstruction and were treated with a staged procedure (like Hartman operation) in 9 cases and with intraoperative colonic wash-out with primary anastomosis in 4 cases. The last group had a good postoperative course without an increased incidence of anastomotic leakage (no one in our limited experience). Compared with staged surgery, immediate resection and anastomosis had significant advantages for the patients because: 1) the quality of the life is better (absence of colonstomy); 2) the cumulative hospitalization is reduced (15 days vs 32 days); 3) there is a reduction in operative risk and in the cumulative intra- and postoperative immunodepression. The correct evaluation of the effect on the long-term survival of these factors needs larger series and of longer follow-up.