Frontiers in Neurology (May 2022)

Case Report: Fremitus Nystagmus in Superior Canal Dehiscence Syndrome

  • Miranda Morrison,
  • Athanasia Korda,
  • Franca Wagner,
  • Marco Domenico Caversaccio,
  • Georgios Mantokoudis

DOI
https://doi.org/10.3389/fneur.2022.844687
Journal volume & issue
Vol. 13

Abstract

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Superior canal dehiscence syndrome (SCDS) is a structural bony defect of the roof of the superior semi-circular canal into the middle cranial fossa and is responsible for the creation of a third window, which alters the dynamics of the inner ear. During humming, vibratory waves entering the vestibulum and cochlea are re-routed through the dehiscence, leading to stimulation of the otolithic and ampullary vestibular organs. This is responsible for the torsional-vertical nystagmus known as “fremitus nystagmus”. In this case report, we video-document a rare case of fremitus nystagmus and its resolution after plugging of the superior semi-circular canal.

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