A case of mucocele of the appendix associated with an increase in serum CEA level is presented. A 80-year-old women was seen at our hospital because she noticed a right lower abdominal mass and three months earlier. Physical examination revealed a mass with a tenderness . Except for anemia detected on admission, there was no biochemical abnormalities. High levels of tumor markers were noted ; CEA was 16.4 ng/ml. CT examination showed a cystic lesion at the ileo-cecal region. With a preoperative diagnosis of appebdiceal mucocele, cecal resection was performed. The resected appendix was smooth in surface and a monolocular cyst, and the lumen was filled a yellowish and gelatine-like substance.
The appendix was histologically diagnosed as mucinous cystadenoma.
The serum CEA level returned normal,1.5 ng/ml, half a month after the surger
