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Narrow Internal Auditory Meatus
An Idiopathic Case Confirming the Origin and Pathway of Vestibular Evoked Myogenic Potentials in Humans
Ken Ito, MD;
Shin-ichi Ishimoto, MD;
Toshihisa Murofushi, MD
Arch Otolaryngol Head Neck Surg. 2001;127:275-278.
Objective To confirm the origin and pathway of vestibular evoked myogenic potentials
(VEMPs) in humans.
Design Case study.
Setting University hospital.
Patient A patient with a narrow internal auditory meatus (IAM).
Main Outcome Measures Imaging studies and functional studies concerning the seventh and eighth
cranial nerves.
Results Of the 4 nerves in the IAM, all but the cochlear nerve had normal function
and normal courses, despite the pronounced narrowing of the IAM. The facial
nerve had a normal diameter, but the vestibular nerves were thinner. Imaging
revealed that the cochlear nerve was absent or extremely thinned. Both the
cochlea and the cochlear nerve showed no function in the affected ear, although
the VEMPs were evoked normally.
Conclusion Our results definitively support the vestibular origin of VEMPs in humans.
From the Department of Otolaryngology, Faculty of Medicine, University
of Tokyo, Tokyo, Japan.
Corresponding author and reprints: Ken Ito, MD, Laboratoire EMI 99-27
INSERM, CHU Hôpital Pellegrin, Bâtiment PQR entrée 3, 2ème
étage, Place Amélie Raba Léon, 33076 Bordeaux, France
(e-mail: itoken-tky{at}umin.ac.jp).
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