A case of a giant mucinous cyst adenoma of the appendix

Abstract

A 75-year-old male was admitted to our hospital complaining upper abdominal pain. Abdominal CT scan visualized a cystic lesion 12×6×6cm in diameter with partial calcification on the wall. The tumor existed between the gall bladder and the cecum, lying on the back of the ascending colon. Preoperative diagnosis was retroperitoneal neurogenic tumor or mesenteric cyst. However, the operative diagnosis was mucinous cyst adenoma of the appendix. We performed right colectomy considering malignant potential from its size. No malignant findings were revealed by histological examination.