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Auditory brainstem implantation: anatomy and approaches.

Noritaka Komune1, Kaan Yagmurlu, Satoshi Matsuo

  • 1*Department of Neurosurgery, University of Florida, College of Medicine, Gainesville, Florida; ‡Department of Neurosurgery, Fukuoka University, Fukuoka, Japan.

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Summary

Auditory brainstem implantation can target the cochlear nuclei or inferior colliculus. Both translabyrinthine and retrosigmoid approaches offer adequate surgical access for electrode placement in these auditory pathway structures.

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Area of Science:

  • Neurosurgery
  • Otolaryngology
  • Auditory Neuroscience

Background:

  • Auditory brainstem implantation, initially for neurofibromatosis type 2 patients with bilateral cochlear nerve loss, now includes the inferior colliculus.
  • This study focuses on the surgical anatomy relevant to these implantation sites.

Purpose of the Study:

  • To examine the microsurgical and endoscopic anatomy of the cochlear nuclei and inferior colliculus.
  • To evaluate the translabyrinthine and retrosigmoid surgical approaches for auditory brainstem implantation.

Main Methods:

  • Examination of ten adult cadaveric cerebellopontine angles using surgical microscopy and endoscopy.
  • Fiber dissection technique to study ascending auditory pathways from cochlear nuclei to inferior colliculi.

Main Results:

  • Both translabyrinthine and retrosigmoid approaches provide sufficient exposure for implantation at the cochlear nuclei or inferior colliculus.
  • The inferior colliculus is an accessible alternative implantation site via infratentorial supracerebellar exposure if cochlear nuclei are unsuitable.
  • Endoscopic assistance can improve exposure and electrode placement at both sites.

Conclusions:

  • Translabyrinthine and retrosigmoid approaches grant access to the cochlear nuclei for implantation.
  • These approaches also allow access to the inferior colliculus via an infratentorial supracerebellar route.
  • Endoscopy may enhance visualization and aid implantation at either the cochlear nuclei or inferior colliculus.