Isolated lateral semicircular canal aplasia: Functional consequences

We report a rare case of a young patient with isolated lateral semicircular canal aplasia and no associated vestibular symptoms. Clinical case summary A 20-year-old man with no personal or family history presented with persistent unilateral tinnitus for three years with no associated vestibular symptoms. Moderate unilateral right sensorineural hearing loss was detected. Magnetic resonance imaging demonstrated isolated aplasia of the right lateral semicircular canal. Videonystagmography revealed right hyporeflexia. Vestibular evoked myogenic potentials were absent after stimulation on the right side and normal on the left side. Discussion Although the morphological abnormalities appeared to be isolated on imaging, the patient presented functional signs of global cochlear, semicircular can…

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