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  • Title: Middle fossa decompression for hearing preservation: a review of institutional results and indications.
    Author: Slattery WH, Hoa M, Bonne N, Friedman RA, Schwartz MS, Fisher LM, Brackmann DE.
    Journal: Otol Neurotol; 2011 Aug; 32(6):1017-24. PubMed ID: 21725256.
    Abstract:
    OBJECTIVE: To assess the duration of hearing preservation from time of vestibular schwannoma middle fossa decompression with short-term and 1-year hearing preservation rates. STUDY DESIGN: Retrospective case review. SETTING: Tertiary referral center. PATIENTS: Patients with and without neurofibromatosis type 2 who underwent middle fossa decompression. We excluded patients without tumor size or audiograms at initial diagnosis or follow-up less than 3 months. INTERVENTIONS: Middle cranial fossa decompression, audiometry, and magnetic resonance imaging. MAIN OUTCOME MEASURES: Period of hearing maintenance (from surgery to longest time point that preoperative American Academy of Otolaryngology-Head and Neck Surgery [AAO-HNS] hearing class maintained or improved), short-term hearing preservation (within 3 mo of surgery), and 1-year hearing preservation. RESULTS: A total of 49 patients underwent middle fossa decompression of vestibular schwannoma. Approximately 90% of patients had documented hearing loss before surgery, and more than 50% of patients exhibited significant tumor growth before surgery. Of these surgeries, more than 90% were performed in patients with hearing loss in an only hearing ear, and more than 90% were patients with neurofibromatosis type 2. The mean period of hearing maintenance was 2.1 years. The short-term hearing preservation rate as measured by the change from preoperative AAO-HNS hearing class was approximately 90%. The 1-year hearing preservation rate as measured by change from preoperative AAO-HNS hearing class was 63%. CONCLUSION: Middle fossa decompression for vestibular schwannoma can prolong hearing in patients with hearing changes in an only hearing ear. Understanding the duration of hearing preservation can enable more effective counseling of patients considering middle cranial fossa decompression for vestibular schwannoma.
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