_:vb50956006 . _:vb50956006 "url:https://www.ncbi.nlm.nih.gov/pubmed/1503726"^^ . _:vb50956006 . _:vb50956006 . _:vb50956006 "A cholesteatoma located_in paranasal sinus."^^ . _:vb50956006 . _:vb50956006 .