Superior semicircular canal dehiscence: An unusual cause of vertigo
[To cite: Sureshkumar S, Francis AA. Superior semicircular canal dehiscence: An unusual cause of vertigo. Natl Med J India 2022;35:185.]
A 29-year-old man with complaints of rotatory vertigo, right side conductive hearing loss, tinnitus and autophony presented to the outpatients department of ENT. He had normal otoscopic examination. Cervical vestibular-evoked myogenic potential was abnormal (Fig. 1). High-resolution computed tomography temporal bone (plane of Pöschl) revealed a dehiscence of the right superior semicircular canal (Fig. 2). Superior semicircular canal dehiscence or Minor syndrome is a rare disorder characterized by the absence of bone overlying the superior semicircular canal resulting in a third window to membranous labyrinth that may result in a syndrome of vestibular and/or auditory symptoms.
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