Acute diverticulitis of the cecum is an uncommon disease. Anderson1recently reviewed the literature and found 91 cases of this condition and added nine cases reported from the Mayo Clinic. Since his review, 24 additional cases have been reported.2It is the purpose of this paper to present five cases which have been observed at the Boston City Hospital. This brings the total number of cases of diverticulitis of the cecum reported in the accessible literature to 126. The accompanying table is a summary of the five cases from the Boston City Hospital. REPORT OF CASES Case 1.— F. C., a 33 year old white married man, entered the hospital with abdominal pain of two days' duration. Two days before his entry crampy epigastric pain associated with anorexia and nausea but no vomiting or diarrhea had developed.Eight hours before his admission the pain shifted to the right