We report two cases of hepatobiliary cystadenoma. Case 1. A 58-year-old male presented with dull abdominal pain and recurrent jaundice. Abdominal echo revealed biliary tracts dilatation; ERCP revealed amorphous filling defect inside the dilated CBD, a cystic tumor in the left lobe communicated with bile duct was disclosed by MRI/MRCP. He received left lobectomy and microscopic findings proved hepatobiliary cystadenoma. Case 2. Abdominal ultrasound detected a huge cystic tumor over the left hepatic lobe in a 69-year-old male. Abdominal CT revealed a large cystic mass lesion over the left hepatic lobe with septations and multiple papillary projections. A liver biopsy was performed and microscopic findings proved biliary cystadenoma. An abdominal ultrasound 6 months later revealed intrahepatic spread of cystadenocarcinoma over both lobes. Hepatobiliary cystadenoma is a rare benign cystic tumor of the liver. It usually occurs in middle-aged women and can undergo malignant change and become lethal. It is frequently misdiagnosed and should be suspected when a uni- or multilocular cystic lesion with papillary infoldings is detected in the liver by CT or ultrasound. ERCP/MRCP have a role in pre-operative evaluation. Elevated serum and cystic fluid tumor markers CA19-9 are only seen in some patients; cystic fluid cytology does not provide adequate diagnostic aid. Its morphologic features maybe confused with biliary papillomatosis or IPMN of bile duct. Its prognosis is excellent after complete resection.


Hepatobiliarycysta denoma, hepatobiliary cystadenocarcinoma, hepatic cystic tumor, IPMN, biliary papillomatosis, obstructive jaundice