Abstract
We report a case of primary mucinous adenocarcinoma of the appendix diagnosed by mucocele. An 83–year–old woman seen for a lower right abdominal cystic lesion was found in laboratory tests to have mild inflammation and elevated serum CEA and CA19–9. Ultrasonography and computed tomography (CT) showed a cystic mass 10 cm in diameter in front of the cecum and surrounded by inflammation.
We diagnosed the mass as primary appendiceal neoplasm or abscess, conducting right hemicolectomy. The resected specimen showed mucinous discharge from the appendiceal orifice and a cyst communicating with the appendix. The pathological diagnosis was primary mucinous adenocarcinoma of the appendix.
