The article analyzes treatment results of 482 patients of elderly and senile age with complicated colon cancer forms who were in the hospital for war veterans at the period from 2008 to 2014. The more frequent complication of colon cancer was an acute intestinal obstruction (76,8%). Peritumorous inflammation with abscess formation was noted in 13,5% cases, hemorrhage - in 5,6% tumor perforation - in 4,1% cases. The operations were performed by conventional methods and using endovideosurgical technologies in case of complication of colon cancer. Laparoscopic operations had less volume of intraoperative hemorrhage, lower rate of postoperative complications and reduction of the level of postoperative lethality. The rate of lethality was 31,18% after conventional operations and it consisted of 1,81% after laparoscopic surgery. Total postoperative lethality was 24,5%. The maximal level of postoperative lethality was noted in cases of colon cancer complications and it had an ultimate rate (100%) in cases of perforation of locally advanced tumor.