Bilateral dehiscence of the bony cochlear basal turn

Arch Otolaryngol Head Neck Surg. 2004 Dec;130(12):1427-9. doi: 10.1001/archotol.130.12.1427.


Objective: To identify bony labyrinth defects as causing symptoms that might otherwise be difficult to understand.

Design: Imaging investigation on cases of lowered vestibular evoked myogenic potentials (VEMP) threshold.

Setting: Academic tertiary case-referral medical center.

Patients: One patient with continuous bilateral tinnitus.

Interventions: High-resolution computed tomography of petrous bone was performed after audiometry, impedance, and VEMP recording.

Results: We found a previously unreported dehiscence of the bony plate between the basal turn of the cochlea and the carotid canal.

Conclusions: A VEMP study could prompt diagnostic imaging tests that might otherwise be neglected. Moreover, it is important to consider the possibility of a bony dehiscence involving not just the semicircular canals.

Publication types

  • Case Reports

MeSH terms

  • Cochlea / abnormalities*
  • Evoked Potentials, Auditory
  • Humans
  • Male
  • Middle Aged
  • Petrous Bone / diagnostic imaging
  • Tinnitus / etiology
  • Tomography, X-Ray Computed