Diverticulum of the caecum is a rare lesion. From a clinical point of view, the inflammation it causes can mimic symptoms of acute appendicitis, causing difficulties in diagnosis and thus prescription of appropriate treatment. It is almost impossible to differentiate this disease from acute appendicitis through physical examination alone, and radiological imaging may also prove insufficient. For this reason, it is common to perioperatively diagnose diverticula of the caecum. Two cases of patients who underwent surgery for perforated caecal diverticula are presently described.