_:vb50956553 . _:vb50956553 . _:vb50956553 "url:http://www.ncbi.nlm.nih.gov/sites/entrez/15763298"^^ . _:vb50956553 "A cholesteatoma which involves invasion of the squamous tissue into a localized area of bony erosion of the ear canal. It may develop spontaneously or as a consequence of infection, trauma or surgery."^^ . _:vb50956553 . _:vb50956553 "url:http://www.ncbi.nlm.nih.gov/sites/entrez/10993445"^^ . _:vb50956553 . _:vb50956553 .