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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
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.
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.
- 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.