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Acoustic neuroma PowerPoint Presentation

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Description : Check out this medical presentation on Acoustic Neuroma, which is titled "Acoustic neuroma", to know about acoustic neuroma (vestibular schwannoma), a benign tumor that develops on the balance (vestibular) and hearing, or auditory (cochlear) nerves leading from your inner ear to the brain.

Tags : Acoustic Neuroma, vestibular schwannoma, benign tumor

Published on : Jul 10, 2021 | Views : 2644 | Downloads : 2

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Slide 1-

Acoustic neuroma Chunfu Dai M.D & Ph.D
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Background Originate from vestibular branch of aucoustic nerve Histologic feature: schwanoma, neuroma, neurolemmoma Predilection: 30-50y Unilateral: majority Bilateral: Type II acoustic neuroma
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Pathology Predominate: internal auditory canal Extension to CPA Compression on brainstem and brain hydrops Anterior: trigeminal nerve, Medial: abducent nerve Inferior: IX, X, XI, XII
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Clinical presentations Hearing loss and tinnitus Progressive HL 90% SDS reduction 10% of patients complain of sudden HL. Unbalance Otalgia and compression due to depression of sensor fiber of facial nerve Involvement of trigeminal nerve Compression of cerebellum and brainstem: ataxia, nystagmus and intracranial hypo-pressure
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Work-up Audiometry PTA: threshold elevated in high frequency tone decay test: positive Speech audiometry Acoustic impedance ABR: latency of wave V prolongs, or wave V disappears Acoustic emission
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Work-up Vestibular function: Neurologic exam Image study CT shows enlargement of internal auditory canal MRI
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Managements Surgery Middle cranionectomy: useful hearing Translabyrinectomy: no useful hearing Nice exposure of facial nerve
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Managements Retro-sigmoid sinus approach: Inferior occipital approach: Big tumor >3cm Nice exposure tumor
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Managements No surgical intervention -Knife observation
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