Two cases of intussusception caused by mucinous cystadenoma of the appendix

We experienced two women, aged 39 years and 46 years, who presented with abdominal pain. In each case, intussusception caused by a cystic tumor was suspected based on abdominal computed tomography. In each case, reduction of the intussusception was easily achieved by gastrografin enema and carbon dioxide insufflation by colonoscopy. From the endoscopic view, the tumors had a submucosal tumorlike appearance in the cecum. We diagnosed the tumors in both patients as mucoceles of the appendix, and ileocecal resections were performed. The pathological diagnosis of the resected specimens was mucinous cystadenoma of the appendix. Intussusception caused by mucinous cystadenoma of the appendix is very rare, and we should keep this condition in mind in the case of intussusception caused by a cystic tumor.