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The aim of our prospective study is to compare and analyze the results of two treatment methods of left-sided malignant colon obstruction: Hartmann's procedure (HP) and Resection with primary anastomosis (RPA). 90 Patients with diagnosis of left-sided malignant colon obstructions were enrolled in this study. The patients were assigned into two groups: Hartmann's procedure (HP) group and Resection and Primary anastomosis group (RPA). Several clinical characteristics were determined and compared between the groups: hospital stay days, duration of the surgery, postoperative complications (during 30 days after surgery) and mortality was assessed. 37 patients were enrolled in the Hartmann's procedure (HP) group and 53 patients were enrolled in the Primary anastomosis (RPA) group and had undergone different types of colon resections with primary anastomosis. There was 1mortality in HP group and 1 in RPA group. In RPA group, there were 7 complications (13.2%). 1 intraabdominal abscess after colorectal anastomosis, which was cured with antibiotic therapy and percutaneous drainage; 5 cases of wound infections, 1- leak of colorectal anastomosis and in Hartmann's procedure group there were 8 (21.6%) complications (7 - wound infections, 1-necrosis of colostomy). But this difference is not statistically reliable (p=0.110). In stenting RPA stay were - 6 days and in HP group, it was 8 days. This difference is statistically reliable (P=0.02). In case of left-sided malignant colon obstructions, Primary anastomosis intervention should be preferred, rather than Hartmann's procedure. In the future it's needed to perform the randomized trials, which will study the long-term outcomes (recurrence of cancer, survival rate) of this treatment method.