Abstract
A-45-year-old woman complaining of epigastric pain was referred to our hospital with a diagnosis of cholelithiasis. A multilocular tumor, which was 9 cm in diameter and showed slight contrast effect, was detected in the medial segment of liver. Endoscopic retrograde cholangiopancreatography revealed no filling of the cysts, with an exception of a part of the cysts that communicated with the bile duct. Mucinous cystic neoplasm (MCN) of the liver was diagnosed and, we performed an extended left hepatic lobectomy. The pathological diagnosis was MCN, showing flat, single layered cuboidal to columnar epithelium of little atypia and ovarian-type subepithelial stroma. The part of the cyst communicating with the bile duct showed loss of epithelial cells and no ovarian-type stroma. No recurrence has occurred as of 3 months after the operation. The hepatic MCN is a rare cystic tumor of the liver, and the prognosis of the patient is excellent if complete resection is possible. In our case, we had difficulty in diagnosing the tumor preoperatively because of some unusual findings in preoperative examinations.
