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The Prevalence of Superior Semicircular Canal Dehiscence in Conductive and Mixed Hearing Loss in the Absence of Other Pathology Using Submillimetric Temporal Bone Computed Tomography

Lee, Young Hen MD; Rivas-Rodriguez, Francisco MD; Song, Jae-Jun MD; Yang, Kyung-Sook PhD; Mukherji, Suresh K. MD

Journal of Computer Assisted Tomography: March/April 2014 - Volume 38 - Issue 2 - p 190–195
doi: 10.1097/RCT.0b013e3182ab2afb
Neuroradiology

Objective The objective of this study was to assess the relationship between superior semicircular canal dehiscence (SSCD) and hearing impairment.

Methods We retrospectively compared the prevalence of SSCD in the ears classified as conductive hearing loss (CHL), mixed hearing loss (MHL), and normal hearing status using submillimetric temporal bone computed tomography (TBCT) on the basis of coronal and additional reformatted planes dedicated to SSCD.

Results From the patients with CHL (n = 127) and MHL (n = 45), the overall prevalence of SSCD in the ears classified as CHL, MHL, and normal hearing status were 6.6%, 7.2%, and 3.0%, respectively. Furthermore, the odds ratio for SSCD in the absence of any cause of hearing loss (eg, dysfunction of the tympanic membrane or middle ear, TBCT abnormalities, otosclerosis, trauma, surgery) was 5.35 in MHL (4/27; P = 0.037, 95% confidence interval, 1.1–25.81) and 3.31 in CHL (5/61; P = 0.115, 95% confidence interval, 0.75–14.63), compared with normal hearing status.

Conclusions Bony covering of the SSC should be specifically evaluated in patients with hearing impairment using submillimetric TBCT.

From the *Department of Radiology, University of Michigan Medical School, Ann Arbor, MI; †Department of Radiology, Ansan Hospital, Korea University College of Medicine, Ansan-si; ‡Department of Otolaryngology-Head and Neck Surgery, Ilsan Hospital, Dongguk University, Ilsan-si; §Department of Biostatistics, Korea University College of Medicine, Seoul, Republic of Korea.

Received for publication August 15, 2013; accepted October 17, 2013.

Reprints: Young Hen Lee, MD, Department of Radiology, Ansan Hospital, 123, Jeokgeum-ro, Danwon-gu, Ansan-si, Gyeonggi-do, Republic of Korea, 425-707 (e-mail: younghen@korea.ac.kr).

The authors declare no conflict of interest.

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