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The petrosal approach with hearing preservation
W A King1, K L Black, N A Martin
1Division of Neurosurgery, University of California School of Medicine, Los Angeles.
Abstract:
Twenty-six patients with petroclival lesions were operated on via a petrosal approach designed to preserve hearing. The surgical pathology included 14 meningiomas, three chordomas, three epidermoid cysts, four vertebrobasilar aneurysms, and two pontine cavernous malformations. The approach allowed complete resection of 14 of 20 tumors and definitive treatment of all six vascular lesions. Complications included cerebrospinal fluid leakage in three patients, high-frequency sensorineural hearing loss in three, meningitis in one, and cranial nerve palsies (which were usually transient). This approach allows a wide exposure of the petroclival region with decreased operating distance. Cerebellar and temporal lobe retraction are minimized, dural sinus patency is maintained, and the inner ear structures are not sacrificed. The approach is suitable for neoplastic or vascular lesions involving the petroclival region, the ventral pons, or the basilar artery trunk. The surgical technique, indications, and neuro-otological considerations are discussed.
Insights
A novel petrosal surgical approach successfully treated petroclival tumors and vascular lesions while preserving hearing. This technique minimizes brain retraction and protects inner ear structures, offering a viable option for complex skull base surgeries.
Area of Science:
- Neurosurgery
- Skull Base Surgery
- Cerebrovascular Surgery
Background:
- Petroclival lesions present significant surgical challenges due to their deep location.
- Traditional approaches may involve substantial retraction or sacrifice of neurovascular structures.
- Preservation of neurological function, particularly hearing, is a critical consideration.
Purpose of the Study:
- To evaluate the efficacy and safety of a modified petrosal approach for petroclival lesions.
- To assess the technique's ability to preserve hearing and minimize neurological deficits.
- To determine the suitability of the approach for various neoplastic and vascular pathologies.
Main Methods:
- Retrospective analysis of 26 patients undergoing a hearing-preserving petrosal approach.
- Surgical pathology included meningiomas, chordomas, epidermoid cysts, aneurysms, and cavernous malformations.
- Detailed assessment of surgical outcomes, complications, and neuro-otological results.
Main Results:
- Complete tumor resection achieved in 14 of 20 tumors; all 6 vascular lesions were definitively treated.
- Low complication rates, including transient cranial nerve palsies and occasional cerebrospinal fluid leakage.
- High-frequency sensorineural hearing loss occurred in three patients; inner ear structures were preserved.
- The approach provided wide exposure with minimal cerebellar and temporal lobe retraction.
Conclusions:
- The modified petrosal approach is effective for treating a range of petroclival lesions.
- It offers excellent exposure while preserving hearing and minimizing neurological injury.
- This technique is a valuable option for complex skull base pathologies involving the petroclival region.