Diverticulosis refers to the presence of diverticula, or herniations of the intestinal mucosa and submucosa, most often in the sigmoid colon. More than one half of patients over age 50 have incidental colonic diverticula. Diverticulitis is the most common complication of diverticulosis, occurring in up to 20% of patients, and results from a microperforation of a diverticulum from inspissated fecal material that often becomes a phlegmon, or a pericolic or intra - abdominal abscess. The presented clinical case is about diverticular disease (Diverticulosis). It generally affects older patients. It is produced by herniation of the mucosa and submucosa through the muscular layer of the colon.