_:vb50953881 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4106371/"^^ . _:vb50953881 "A biliary tract benign neoplasm that is located_in the bile duct and derives_from epithelial cells."^^ . _:vb50953881 . _:vb50953881 . _:vb50953881 . _:vb50953881 . _:vb50953881 .