title: Unilateral musical hallucination after a hybrid cochlear implantation.
abstract: OBJECTIVE
  To provide a description of musical hallucination associated with hybrid cochlear implantation.
  
  
  METHODS
  Case report.
  
  
  RESULTS
  We report a case of musical hallucination secondary to hybrid cochlear implantation. Activation of electrical stimulation was closely related to onset of musical hallucination and deactivation was associated with attenuation of hallucination. Persistent musical hallucination severely impaired speech discrimination in spite of 2 years of listening rehabilitation.
  
  
  CONCLUSIONS
  The hybrid cochlear implant is a relatively new surgical method, and its side effects have not been well documented. This is the first report of musical hallucination after a hybrid cochlear implantation. Also we provide evidence of the peripheral origin of musical hallucination by reporting lateralization and intensity change of hallucination by activation status of cochlear implant.
authors.affiliation: Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea. Electronic address: biophilia1@paran.com.
authors.forename: Soohyun
authors.initials: S
authors.lastname: Joe
authors.affiliation: Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea. Electronic address: drpark98@naver.com.
authors.forename: Jangho
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea. Electronic address: jongshox@gmail.com.
authors.forename: Jongseok
authors.initials: J
authors.lastname: Lim
authors.affiliation: Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea. Electronic address: choong10000@hanmail.net.
authors.forename: Choongman
authors.initials: C
authors.lastname: Park
mesh_terms: D019929:Cochlear Implantation / Q000009:adverse effects*; D003054:Cochlear Implants / Q000009:adverse effects*; D006212:Hallucinations / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009146:Music
keywords: Cochlear implantation; Electric–Acoustic stimulation; Hybrid cochlear implantation; Musical hallucination; Peripheral origin