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Related Experiment Videos

Subtonsillar placement of auditory brainstem implant.

Y Seki1, N Samejima, K Kumakawa

  • 1Department of Neurosurgery, Tokyo Kyosai Hospital, Tokyo, Japan. yoseki@tkh.meguro.tokyo.jp

Acta Neurochirurgica. Supplement
|October 2, 2003
PubMed
Summary

A novel subtonsillar approach for auditory brainstem implant placement in acoustic neuroma surgery preserved hearing and protected lower cranial nerves. This technique offers advantages over traditional surgical routes for neurofibromatosis type 2 patients.

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A rare case of acoustic neuroma extending from the cerebellopontine angle to the external auditory canal.

Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia·2008

Area of Science:

  • Neurosurgery
  • Neuro-oncology
  • Audiology

Background:

  • Neurofibromatosis type 2 (NF2) often necessitates surgical intervention for acoustic neuromas.
  • Acoustic neuromas can lead to lower cranial nerve deficits, complicating surgical approaches.
  • Auditory brainstem implants (ABIs) are used to restore hearing in patients with NF2 and bilateral vestibular schwannomas.

Observation:

  • The subtonsillar approach, a modification of the retrosigmoid route, was utilized for ABI electrode placement.
  • This approach provided direct visualization of the cochlear nucleus.
  • It allowed for precise electrode insertion while minimizing risk to the 9th and 10th cranial nerves.

Findings:

  • The subtonsillar approach facilitated safe and effective ABI electrode placement.

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  • Hearing preservation, measured by pure tone average, was maintained near preoperative levels.
  • Injury to the 9th and 10th cranial nerves was successfully avoided during electrode insertion.

    • Implications:

    • The subtonsillar approach represents a valuable alternative for ABI placement in complex NF2 cases.
    • This technique may improve functional outcomes and reduce postoperative morbidity.
    • Further research should explore the long-term efficacy and broader applicability of the subtonsillar approach for ABI surgery.