Hepatobiliary cystadenoma with mesenchymal stroma--a case report.

Hepatobiliary cystadenoma with mesenchymal stroma (HCMS) is a rare lesion characterized by multiloculated cyst lined by columnar epithelium ad mesenchymal stroma. It occurs exclusively in females and is intrahepatic in location with only 17% cases arising in extrahepatic biliary tree. Exact histogenesis is not known, but it is hypothesized the HCMS arises from ectopic embryonic tissue destined to form the adult gall bladder. HCMS has got a malignant potential and requires radical excision.