title: Postoperative imaging of the internal auditory canal : Visualization of active auditory implants.
abstract: BACKGROUND
  Assessment of the internal auditory canal (IAC) and cochlea is of central importance in neurotology. The artefacts and visibility of active auditory implants on magnetic resonance imaging (MRI) vary because of their specific magnetic components. Knowledge of the size of MRI artefacts and the options for handling them is important for the auditory rehabilitation of specific diseases (e. g., vestibular schwannoma).
  
  
  METHODS
  The current article is a literature review.
  
  
  RESULTS
  MRI assessment of the IAC and cochlea after surgical placement of an active auditory implant is feasible only with a percutaneous bone-anchored hearing aid (BAHA, Ponto). When specific factors (implant position and MRI sequence) are taken into consideration, these structures can be visualized even after cochlear implantation. Complications such as magnet dislocation and pain may occur.
  
  
  CONCLUSIONS
  The possibility of assessing the IAC and cochlea by MRI is an important aspect that needs to be taken into consideration when planning the auditory rehabilitation of patients after acoustic neuroma surgery.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Warener Str. 7, 12683, Berlin, Germany. ingo.todt@ukb.de.
authors.forename: I
authors.initials: I
authors.lastname: Todt
authors.affiliation: Department of Radiology, Unfallkrankenhaus Berlin, Berlin, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Rademacher
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Warener Str. 7, 12683, Berlin, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Mittmann
authors.affiliation: Department of Radiology, Unfallkrankenhaus Berlin, Berlin, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Mutze
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Unfallkrankenhaus Berlin, Warener Str. 7, 12683, Berlin, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Ernst
mesh_terms: D016477:Artifacts; D003051:Cochlea / Q000000981:diagnostic imaging*; D003054:Cochlear Implants; D007758:Ear, Inner / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging; D009464:Neuroma, Acoustic / Q000534:rehabilitation; D011183:Postoperative Complications / Q000000981:diagnostic imaging*
keywords: Cochlea; Cochlear implant; Implantable neurostimulators; Inner ear; Magnetic resonance imaging