Dehiscence Size in SSCD Correlates with Air-Bone Gap Size

Does the size of the dehiscence in SSCD correlate with the size of the air-bone gap?

Background: Patients with superior semicircular canal dehiscence (SSCD) present with a variety of symptoms that may include a low frequency conductive hearing loss on pure-tone audiometry. It has been postulated that this air-bone gap happens when the dehiscent superior canal acts as a third mobile window, dissipating acoustic energy. Not all patients exhibit an air-bone gap, however, and, to date, no study has correlated the size of the air-bone gap with the size of the dehiscence.

Study Design: Retrospective chart review of 23 patients (28 ears) diagnosed with SSCD

Setting: Tertiary referral center in Perth, Australia