Cecal diverticulum is a rare clinical condition which may present as acute abdomen through diverticulitis and perforation of diverticulitis. Surgical treatment of cecal diverticulitis has been controversial, with studies recommending options ranging from conservative management with antibiotics alone to aggressive resection. Two cases, one of which was pre- diagnosed with cecal tumor perforation and the other with cecal tumor leading to intestinal obstruction, were urgently operated. To both patients, right hemicolectomy was applied. Pathologic evaluation revealed cecal diverticulitis in both patients. Right hemicolectomy is principally reserved for patients experiencing perforation of the diverticulum and extensive inflammatory reaction.