The superior semicircular canal dehiscence syndrome (SCDS), which presents with comprehensive symptoms such as hyperacusis, autophony, and pressure-induced vertigo, has been recently recognized in Japan. Three patients with SCDS, in whom severe vestibular symptoms were unable to be controlled with conservative treatments, underwent capping surgery through the middle fossa approach. The preoperatively air-bone gap (AB gap) in the audiometry, the decreased threshold of cervical vestibular evoked myogenic potentials (cVEMP) and bone dehiscence of the superior semicircular canal could be observed in all patients on CT imaging. All patients suffered from positional vertigo for about one week after the operation. However, their cochlear and vestibular symptoms associated with the SCDS were relieved within a few months after the operation. The capping procedure decreased the AB gaps and increased the thresholds of cVEMP in all patients. We suggest that capping surgery via the middle fossa approach for the SCDS is an efficient procedure without severe side effects.
