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Diseases of the temporal bone and schwannoma of the vestibular nerve 

Diseases of the temporal bone and schwannoma of the vestibular nerve
Chapter:
Diseases of the temporal bone and schwannoma of the vestibular nerve
Author(s):

Béla Büki

and Alexander A. Tarnutzer

DOI:
10.1093/med/9780199680627.003.0008
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date: 09 April 2020

Diseases of the temporal bone may elicit fluctuating changes in the spontaneous firing rate of the vestibular nerve or cause permanent vestibular deafferentation. Clinical signs of temporal bone fractures include bleeding from the outer ear canal or blood behind the eardrum and, in cases of labyrinthine or neural damage, signs of unilateral cochleovestibular deafferentation and/or facial nerve palsy. A pathological third labyrinthine window causes pseudo-conductive hearing loss and fluctuating dizziness or vertigo due to pressure or sound-related movements of the perilymph. Since vestibular schwannoma (VS) most frequently presents with unilateral sensorineural hearing loss as a first symptom, every case of sudden or slowly evolving asymmetric sensorineural hearing loss should be evaluated by (at least non-contrast) magnetic resonance imaging (MRI) of the brain.

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