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Increased Intracranial Pressure

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Third Mobile Window Syndrome of the Inner Ear

Abstract

Superior semicircular canal dehiscence (SSCD) is an example of a “third mobile window” (TMW) condition resulting from dehiscence of middle fossa bone over the superior semicircular canal [1]. While not as well characterized as SSCD, other foci of otic capsule dehiscence have also been described, including the posterior semicircular canal, vestibular aqueduct, internal auditory canal, carotid canal, and fallopian canal [2–7]. TMWs allow aberrant sound and energy transfer through the inner ear, leading to classic findings of mixed hearing loss, autophony and vestibular dysfunction. Less specific symptoms, including pulsatile tinnitus, headache, hyperacusis and visual disturbance, may also be present, resulting in difficulty distinguishing TMW conditions from other entities, including migraine variants and idiopathic intracranial hypertension (IIH) [8].

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Doerfer, K.W., Schutt, C.A., Dwyer, S., Kado, K. (2022). Increased Intracranial Pressure. In: Gianoli, G.J., Thomson, P. (eds) Third Mobile Window Syndrome of the Inner Ear. Springer, Cham. https://doi.org/10.1007/978-3-031-16586-3_19

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