The first new otologic disorder in a century: superior canal dehiscence syndrome.

Superior canal dehiscence syndrome is a recently described vestibular and hearing condition caused by an absence of bone over the arc of the superior semicircular canal. Patients with the condition present with a variety of perplexing symptoms including conductive hearing loss, hyperacusis, vertigo, autophony, and eye movement in response to sound. This article presents the case of a patient with the condition, discusses how it is distinct from other vestibular and hearing disorders, and describes how patients with this disorder can be diagnosed and treated.