title: Necrotizing meningoencephalitis mimicking cerebellopontine angle tumor as late complication following cochlear implantation.
abstract: We describe for the first time localized necrotizing meningoencephalitis as the cause of functional hearing loss, facial nerve palsy, and vertigo after cochlear implant (CI) surgery. Magnet resonance imaging (MRI) and computed tomography scans before CI surgery and after 3 years showed  no abnormalities, especially no evidence of a tumor in the cerebellopontine angle (CPA). Due to recurrent facial nerve palsy the CI was explanted after 5 years in order to be able to visualize the CPA without artifacts caused by the CI in MRI scans. The MRI scans now showed a tumor in the  CPA. Following removal of the tumor, histopathological and immunohistochemical examination revealed a necrotizing meningoencephalitis, with the CI electrode as the focus.
authors.affiliation: Department of Oto-Rhino-Laryngology, Head and Neck Surgery, University Medical Center Freiburg, Germany. susan.arndt@uniklinik-freiburg.de
authors.forename: Susan
authors.initials: S
authors.lastname: Arndt
authors.forename: Christian
authors.initials: C
authors.lastname: Schild
authors.forename: Soroush
authors.initials: S
authors.lastname: Doostkam
authors.forename: Ralf
authors.initials: R
authors.lastname: Birkenhäger
authors.forename: Roland
authors.initials: R
authors.lastname: Laszig
authors.forename: Marco
authors.initials: M
authors.lastname: Prinz
authors.forename: Antje
authors.initials: A
authors.lastname: Aschendorff
mesh_terms: D019929:Cochlear Implantation / Q000009:adverse effects* / Q000379:methods; D003054:Cochlear Implants / Q000009:adverse effects*; D003937:Diagnosis, Differential; D005158:Facial Paralysis / Q000175:diagnosis / Q000209:etiology; D005260:Female; D005500:Follow-Up Studies; D006312:Hearing Loss, Bilateral / Q000175:diagnosis / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008590:Meningoencephalitis / Q000175:diagnosis* / Q000209:etiology* / Q000473:pathology / Q000628:therapy; D008875:Middle Aged; D009336:Necrosis / Q000473:pathology; D009464:Neuroma, Acoustic / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D018570:Risk Assessment; D012720:Severity of Illness Index; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods; D016896:Treatment Outcome