Cochlear Aqueduct Morphology in Superior Canal Dehiscence Syndrome

Author:

Nagururu Nimesh V.1ORCID,Jung Diane1,Hui Ferdinand2,Pearl Monica S.3,Carey John P.1,Ward Bryan K.1

Affiliation:

1. Department of Otolaryngology—Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA

2. Department of Radiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA

3. Department of Radiology, Children’s National Hospital, Washington, DC 20010, USA

Abstract

The cochlear aqueduct (CA) connects the scala tympani to the subarachnoid space and is thought to assist in pressure regulation of perilymph in normal ears, however, its role and variation in inner ear pathology, such as in superior canal dehiscence syndrome (SCDS), is unknown. This retrospective radiographic investigation compared CA measurements and classification, as measured on flat-panel computerized tomography, among three groups of ears: controls, n = 64; anatomic superior canal dehiscence without symptoms (SCD), n = 28; and SCDS, n = 64. We found that in a multinomial logistic regression adjusted for age, sex, and BMI, an increase in CA length by 1 mm was associated with a lower odds for being in the SCDS group vs. control (Odds ratio 0.760 p = 0.005). Hierarchical clustering of continuous CA measures revealed a cluster with small CAs and a cluster with large CAs. Another multinomial logistic regression adjusted for the aforementioned clinical covariates showed an odds ratio of 2.97 for SCDS in the small CA cluster as compared to the large (p = 0.004). Further, no significant association was observed between SCDS symptomatology—vestibular and/or auditory symptoms—and CA structure in SCDS ears. The findings of this study lend support to the hypothesis that SCDS has a congenital etiology.

Funder

Robert and Kate Niehaus Foundation

National Institutes of Health

Publisher

MDPI AG

Subject

Podiatry,Otorhinolaryngology

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