title: Extrahepatic biliary cystadenoma with mesenchymal stroma: a true biliary cystadenoma? A case report.
abstract: Biliary cystadenomas are benign but potentially malignant cystic neoplasms, which classically contain mesenchymal stroma similar to ovarian tissue. We report a case of an extra-hepatic biliary cystadenoma with mesenchymal stroma along with a discussion of current pathological opinion.
  
  
  METHODS
  A 54-year-old female presented with abdominal pain, abnormal liver function tests and a mass on ultrasound. Computerized Tomography identified a complex multi-locular cyst in the common hepatic duct. Radical excision of the lesion and a Roux-en-Y loop bilio-enteric anastomosis was performed. Histology confirmed the presence of a benign biliary cystadenoma with ovarian type stroma.
  
  
  CONCLUSIONS
  Biliary cystadenomas classically contain mesenchymal stroma similar to ovarian tissue. It now appears that cystadenomas without mesenchymal stroma appear to be more akin to similar cystic lesions of the pancreas, and may represent a dissimilar neoplasm. Therefore, malignant transformation can occur, so complete excision is recommended.
authors: Department of Hepatobiliary and Liver Transplant Surgery, St. Vincent's University Hospital, Elm Park, Dublin, Ireland. derek.hennessey@gmail.com
authors: Derek B
authors: DB
authors: Hennessey
authors: Oscar
authors: O
authors: Traynor
mesh_terms: D000713:Anastomosis, Roux-en-Y; D001650:Bile Duct Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D003537:Cystadenoma / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D005260:Female; D046152:Gastrointestinal Stromal Tumors / Q000150:complications / Q000175:diagnosis* / Q000556:secondary / Q000601:surgery; D006500:Hepatic Duct, Common; D006801:Humans; D008875:Middle Aged; D010051:Ovarian Neoplasms / Q000150:complications / Q000175:diagnosis* / Q000556:secondary / Q000601:surgery; D014057:Tomography, X-Ray Computed; D014463:Ultrasonography