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Internal Acoustic Canal Stenosis Due to Hyperostosis
Amir Goodarzi1, Atrin Toussi1, Nicholas Garza1
1Department of Neurological Surgery, Davis School of Medicine, University of California, Sacramento, California, United States.
Journal of Neurological Surgery. Part B, Skull Base
|June 6, 2020
Summary
Benign bone lesions called exostoses and osteomas can affect the internal acoustic canal (IAC). Surgical decompression may resolve vertigo and improve tinnitus in patients with IAC exostoses, preserving hearing.
Area of Science:
- Otolaryngology
- Neurosurgery
- Neuroskeletal Pathology
Background:
- Exostoses and osteomas are rare, slow-growing bone tumors.
- These benign lesions can affect the internal acoustic canal (IAC), leading to cranial nerve dysfunction.
Purpose of the Study:
- To present two cases of IAC exostoses treated with surgical decompression.
- To review the literature and analyze clinical outcomes of surgical decompression for IAC exostoses and osteomas.
Main Methods:
- A systematic literature search was performed using PubMed, Web of Science, and Google Scholar.
- Twenty-six previously reported cases of IAC exostoses and osteomas were identified and analyzed.
- Clinical presentation, management strategies, and surgical outcomes were extracted.
Main Results:
- Thirteen patients underwent surgical decompression.
- Eight patients experienced resolution of vertigo, and ten had improved tinnitus.
- All patients maintained serviceable hearing post-surgery.
Conclusions:
- Internal acoustic canal (IAC) exostoses and osteomas cause insidious vestibulocochlear nerve dysfunction.
- Surgical decompression appears more effective for vertigo symptoms than for tinnitus or sensorineural hearing loss.
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