Article Text

PDF
Superior semicircular canal dehiscence syndrome by the superior petrosal sinus
  1. Ja-Won Koo1,2,
  2. Sung Kwang Hong1,
  3. Dong-Kyu Kim1,
  4. Ji Soo Kim3
  1. 1Department of Otorhinolaryngology—Head & Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
  2. 2Research center for Sensory Organs, Medical Research Center, Seoul National University, Seoul, Republic of Korea
  3. 3Department of Neurology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
  1. Correspondence to Professor Ja-Won Koo, Department of Otorhinolaryngology—Head & Neck Surgery, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam, Gyeonggi-do 463-707, Republic of Korea; jwkoo99{at}snu.ac.kr

Abstract

Thinning or dehiscence of the superior semicircular canal may occur on the middle cranial fossa floor or adjacent to the superior petrosal sinus (SPS). However, no symptomatic cases of superior canal dehiscence by SPS have been previously described. A 45-year-old woman presented with left-side pulsating tinnitus, autophony and disequilibrium. Examination showed conductive hearing loss and decreased threshold of vestibular evoked myogenic potential in the left side. Sound and vibration stimuli and positive pressure insufflations into the left ear evoked mainly torsional nystagmus instead of vertical-torsional nystagmus. High-resolution temporal bone CT revealed a dehiscence of the superior canal close to the common crus, which was encased by SPS. Symptoms and signs resolved after plugging the dehiscence through a middle fossa approach. Deep groove of SPS may cause superior canal dehiscence close to the common crus, and costimulation of the superior and posterior canals may explain the mainly torsional nystagmus induced by sound and vibration stimuli.

  • Semicircular canal
  • cranial sinuses
  • pulsatile tinnitus
  • vertigo

Statistics from Altmetric.com

Footnotes

  • Funding This article was supported by Seoul National University Bundang Hospital Research Fund (grant number 02-2007-009).

  • Competing interests None.

  • Patient consent Obtained.

Request permissions

If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.