[Superior semicircular dehiscence syndrome].

Disorders of the equilibrium have a variety of etiologies and are common reasons for medical consultations. A thorough diagnostic workup is mandatory. A dehiscent superior semicircular canal may be a rare, but characteristic situation which is responsible for specific symptoms and clinical findings. Typical are sound and/or pressure induced vertigo, autophonia, pulsatile tinnitus, hyperacusis and aural fullness. High resolution CT-scan of the temporal bone reveals a missing bony cover over the superior semicircular canal such causing a third "mobile window". Besides patients' counselling plugging and/or resurfacing via a transmastoid or transtemporal approach may be therapeutic options.