Inclusion Criteria:  Aged 18 years or older; Patients admitted in Emergency setting for left-sided colonic disease (perforated diverticulitis with purulent or fecal peritonitis; large bowel perforation-obstruction; colon cancer perforation-obstruction; ischemic colitis; abdominal trauma). Patients who underwent urgent or emergency surgery for left-sided colonic disease (perforated diverticulitis with purulent or fecal peritonitis; large bowel perforationobstruction; colon cancer perforation-obstruction; ischemic colitis; abdominal trauma).  Exclusion Criteria:  Aged 17 or younger. Elective surgery. Non-surgical treatment. Patients with personal history of colorectal cancer treated surgically. Patients with stoma. Unstable patients who benefited of damage control procedures.