title: Assessment of the cochlear nerve to facial nerve size ratio using MR multiplanar reconstruction of the internal auditory canal in patients presenting with acquired long-standing hearing loss.
abstract: OBJECTIVE
  To test using the facial nerve as a reference for assessment of the cochlear nerve size in patients with acquired long-standing sensorineural hearing loss (SNHL) using MRI multiplanar reconstruction.
  
  
  METHODS
  The study was retrospectively performed on 86 patients. Group 1 (study group, n = 53) with bilateral long-standing SNHL. Group 2 (control group, n = 33) without hearing loss. The nerve size was measured by drawing a region of interest around the cross-sectional circumference of the nerve in multiplanar reconstruction images.
  
  
  RESULTS
  No significant correlation was noted between the cochlear nerve and facial nerve size, and the patient's age, gender and weight (p > 0.05). In Group 1, the mean ratio of the cochlear to facial nerve size was 0.99 ± 0.30 (range: 0.52-1.86) and 1.12 ± 0.35 (range: 0.34-2.3) for the right and left sides, respectively. In Group 2, it was 1.18 ± 0.23 (range: 0.78-1.71) and 1.25 ± 0.25 (range: 0.85-1.94) for the right and left sides, respectively. The cochlear nerve size was statistically (p = 0.0004) smaller in Group 1 than in Group 2.
  
  
  CONCLUSIONS
  The cochlear nerve size and the cochlear to facial nerve size ratio are significantly smaller in patients with acquired long-standing SNHL. Advances in knowledge: The facial nerve can be used as a reference for assessment of the cochlear nerve in patients with acquired long-standing SNHL.
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.|3 Department of Radiology, Faculty of Medicine, Alexandria university, Alexandria, Egypt.
authors.forename: Nagy N N
authors.initials: NNN
authors.lastname: Naguib
authors.affiliation: 2 Department of Otolaryngology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Constanze
authors.initials: C
authors.lastname: Hey
authors.affiliation: 3 Department of Radiology, Faculty of Medicine, Alexandria university, Alexandria, Egypt.
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Shaaban
authors.affiliation: 3 Department of Radiology, Faculty of Medicine, Alexandria university, Alexandria, Egypt.
authors.forename: Amr M
authors.initials: AM
authors.lastname: Elabd
authors.affiliation: 3 Department of Radiology, Faculty of Medicine, Alexandria university, Alexandria, Egypt.
authors.forename: Hebatallah H M
authors.initials: HHM
authors.lastname: Hassan
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Tatjana
authors.initials: T
authors.lastname: Gruber-Rouh
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Kaltenbach
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Marc
authors.initials: M
authors.lastname: Harth
authors.affiliation: 4 Department of Biomedical Statistics, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Hanns
authors.initials: H
authors.lastname: Ackermann
authors.affiliation: 2 Department of Otolaryngology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Timo
authors.initials: T
authors.lastname: Stöver
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Vogl
authors.affiliation: 1 Institute for Diagnostic and Interventional Radiology, Frankfurt University Hospital, Frankfurt, Germany.|3 Department of Radiology, Faculty of Medicine, Alexandria university, Alexandria, Egypt.
authors.forename: Nour-Eldin A
authors.initials: NA
authors.lastname: Nour-Eldin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003056:Cochlear Nerve / Q000000981:diagnostic imaging*; D007758:Ear, Inner / Q000000981:diagnostic imaging*; D005154:Facial Nerve / Q000000981:diagnostic imaging*; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D013701:Temporal Bone / Q000000981:diagnostic imaging*; D013997:Time Factors; D055815:Young Adult