<prompt> True about Biliiary cystic adenocarcinomaCT scan is used for diagnosisCA 19-9 is elevatedIntrahepatic locationExtrahepatic location  <response>: .hepatic cystadencarcinoma arising from pre existing cystadenoma with mesenchymal stroma,which occurs only in young females ,carries good prognosis.resection is the treatment .it carries good prognosis.MRI is diagnostic.USCT scan is also helpful.ERCP is done to identify communication with biliary sysytem.usually to proximal left hepatic duct. ref : SRB;s manual of surgery,5 th ed,pg no 614 