Abstract
We report a rare case of metachronous mucinous cystadenoma of the appendix that occured after the resection of an inguinal canal mucinous tumor. A 67-year-old male was found to have a mucinous tumor in the right inguinal canal. On histopathology, the tumor was suspected to be a pseudomyxoma or a mesothelioma, but an exact diagnosis could not be made. Seven months later, he was found to have a cystic tumor of the appendix ; it was successfully resected. The tumor was diagnosed as a mucinous cystadenoma. Mucinous cystadenoma of the appendix can cause pseudomyxoma peritonei ; therefore, it should be resected as soon as possible. Patients with a mucinous tumor involving any of the tissues derived from the peritoneum should be followed postoperatively so as not to miss the development of other mucinous cystic tumors.
