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The most reliable indicator for acoustic neuromas from the ABR is the interaural latency differences in wave V: the latency in the impaired ear is prolonged. Different studies have indicated the sensitivity of ABR for detection of acoustic neuromas 1cm or larger to be between 90 and 95%. Sensitivity for neuromas smaller than 1cm are 63-77%.
A vestibular schwannoma (VS), also called acoustic neuroma, is a benign tumor that develops on the vestibulocochlear nerve that passes from the inner ear to the brain. The tumor originates when Schwann cells that form the insulating myelin sheath on the nerve malfunction. Normally, Schwann cells function beneficially to protect the nerves which ...
Tumours can arise in the cerebellopontine angle. Four out of five of these tumours are vestibular schwannomas (commonly known as acoustic neuromas). [3] Others found include: Arachnoid cyst; Facial nerve tumour; Lipoma; Meningioma; Schwannoma of other cranial nerves (e.g. CN V >VII>IX, X, XI) Metastasis; Intracranial epidermoid cyst
The hearing loss caused by NF2 is gradual and results from the presences of bilateral cochleovestibular schwannomas, also known as acoustic neuromas, which damage to cochlear nerve causing hearing loss. [citation needed] Hearing loss may also result from benign tumors that grow on the vestibular and auditory nerves, which lead to the inner ear.
Transneuronal degeneration is the death of neurons resulting from the disruption of input from or output to other nearby neurons. [1] It is an active excitotoxic process when a neuron is overstimulated by a neurotransmitter (most commonly glutamate) [2] causing the dysfunction of that neuron (either damaging it or killing it) which drives neighboring neurons into metabolic deficit, resulting ...
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The translabyrinthine approach was developed by William F. House, M.D., [2] who began doing dissections in the laboratory with the aid of magnification and subsequently developed the first middle cranial fossa and then the translabyrinthine approach for the removal of acoustic neuroma.
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