_:vb50938645 . _:vb50938645 . _:vb50938645 . _:vb50938645 . _:vb50938645 . _:vb50938645 "url:http://en.wikipedia.org/wiki/Mastoiditis"^^ . _:vb50938645 . _:vb50938645 "A middle ear disease characterized by an inflammation of the mucosal lining of the mastoid antrum and the mastoid air cell system inside the mastoid process."^^ . _:vb50938645 "url:http://www.nlm.nih.gov/medlineplus/ency/article/001034.htm"^^ .