_:vb50948733 . _:vb50948733 . _:vb50948733 "url:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5532898/"^^ . _:vb50948733 . _:vb50948733 . _:vb50948733 . _:vb50948733 "A bladder benign neoplasm that derives_from smooth muscle cells."^^ .