_:vb50948033 . _:vb50948033 . _:vb50948033 . _:vb50948033 . _:vb50948033 . _:vb50948033 "url:https://www.ncbi.nlm.nih.gov/pubmed/23894911"^^ . _:vb50948033 "An ureteral benign neoplasm that derives_from smooth muscle cells."^^ .