The one-staged subtotal/total colectomy with formation of primary ileo-sigmoanastomosis or ileo-rectal anastomosis is applied in tumoral left colonic ileus. There were estimated immediate results and the role of the method in the treatment of 46 patients with left colonic obstructive tumor. Postoperative complications had occurred in 52% of the patients, postoperative mortality had constituted 10.9%. Performance of subtotal/total colectomy with formation of primary anastomosis constitutes the alternative and preferable method of treatment of patients with left colonic obstructive tumor.