Department of Otolaryngology Head and Neck Surgery, University of Missouri, Cleveland, OH, USA.
Department of Radiology, University of Missouri, Cleveland, OH, USA.
Ann Otol Rhinol Laryngol. 2021 Dec;130(12):1400-1406. doi: 10.1177/00034894211007257. Epub 2021 Apr 9.
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).
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.
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.
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.
报告一系列同时存在上半规管裂和鼓室天盖裂并伴有锤骨头与硬脑膜接触（DCMH）的患者病例。
对在一家三级保健机构就诊的 4 例同时存在 SSCD 和 DCMH 的患者的影像学和听力数据进行分析。同时进行了相关文献复习。
4 例患者（5 耳）存在 SSCD 和 DCMH。在 3 例单侧 DCMH 的患者中，患耳的最大气骨导差为 15dB，而对侧耳为 50dB。在 5 例 DCMH 耳中，250Hz 时气导阈值的平均值为 17dB，而在 3 例无 DCMH 耳中为 42dB。
我们报告了 4 例双侧 SSCD 患者中 DCMH 的发现。这一有限的系列研究表明，存在 SSCD 和 DCMH 的耳的气骨导差小于预期，因为人们会预期 DCMH 和 SSCD 对气骨导差的相加效应。
