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Endoscopic cochlear implantation: Call for caution.

Muaaz Tarabichi1, Omar Nazhat2, Jamal Kassouma2

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Summary

Transcanal endoscopic access may not be ideal for cochlear implantation. Posterior tympanotomy offers a more favorable trajectory to the cochlea's basal turn compared to transcanal approaches.

Keywords:
Endoscopic ear surgerycochlear implantendoscopic cochlear implanttranscanal approach

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Area of Science:

  • Otolaryngology
  • Neurosurgery
  • Medical Imaging

Background:

  • Cochlear implantation aims to restore hearing by accessing the cochlea.
  • Transcanal endoscopic techniques are increasingly used in otologic surgery.
  • The basal turn of the cochlea is a critical target for electrode insertion.

Purpose of the Study:

  • To evaluate the suitability of transcanal endoscopic access to the cochlea's basal turn for cochlear implantation.
  • To compare the anatomical trajectory of transcanal access with posterior tympanotomy relative to the basal turn.

Main Methods:

  • Retrospective review of 100 computed tomographic (CT) studies of the sinuses and temporal bone.
  • Exclusion of studies with anomalies, chronic ear disease, or poor cochlear visualization.
  • Measurement of angles of the basal turn and ear canal relative to the sagittal plane.

Main Results:

  • Eighty-four CT studies were analyzed.
  • Significant anatomical variability was observed between the ear canal and the basal turn.
  • The basal turn predominantly angled more posteriorly than the ear canal.

Conclusions:

  • Posterior tympanotomy provides a more advantageous surgical trajectory to the cochlear basal turn than transcanal access.
  • Endoscopic techniques, focused on the ear canal, may have limited utility in cochlear implant surgery.