Dural Contact to the Malleus Head in Patients with Superior Semicircular Canal Dehiscence (SSCD): Case Series and Review of SSCD and Tegmen Defects. (December 2021)

• Record Type: Journal Article
• Authors: Wentland, Carissa; Cousins, Joseph; May, Jason; Rivera, Arnaldo
• Is Part Of: Annals of otology, rhinology & laryngology. Volume 130:Number 12(2021)
• Page Start: 1400
• Page End: 1406
• Publication Date: 2021-12
• Subjects: superior semicircular canal dehiscence -- miscellaneous -- hearing loss -- skull base defect -- malleus head contact -- air bone gap; Otolaryngology -- Periodicals; 617.51
• DOI: 10.1177/00034894211007257
• Languages: English
• ISSNs: 0003-4894

Abstract

Objective: Report a series of cases in which patients have concomitant superior semicircular canal dehiscence (SSCD) and a dehiscent tegmen tympani with Dural contact to the malleus head (DCMH). Methods: An analysis of radiologic and audiologic data in 4 patients who presented with SSCD and DCMH at a tertiary care institution. A pertinent literature review was performed. Results: Four patients (5 ears) had SSCD and DCMH. In 3 patients with unilateral DCMH, the mean maximum air-bone gap was 15 dB in the ear with DCMH compared to 50 dB in the ear without DCMH. Of the 5 ears with DCMH, the mean air conduction threshold at 250 Hz was 17 dB compared to 42 dB in the 3 ears without DCMH. Conclusions: We report the findings of DCMH in a series of 4 patients with bilateral SSCD. This limited series suggests that ears with SSCD and DCMH have less of an air-bone gap than would be expected, as 1 would expect an additive effect of DCMH and SSCD on the air-bone gap.