CC BY-NC-ND 4.0 · Laryngorhinootologie 2022; 101(S 02): S234-S235
DOI: 10.1055/s-0042-1746486
Abstracts | DGHNOKHC
Imaging / Sonography: Ear / Temporal bone

Update on the radiological diagnosis of enlarged vestibular aqueduct (EVA) – therapeutic and prognostic implications

Nora M Weiss
1   Klinik für Hals-Nasen-Ohrenheilkunde der Ruhr-Universität Bochum, St. Elisabeth-Hospital, Bochum, Bochum
,
Tabita Breitsprecher
1   Klinik für Hals-Nasen-Ohrenheilkunde der Ruhr-Universität Bochum, St. Elisabeth-Hospital, Bochum, Bochum
,
Alexander Pscheidl
2   Klinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, Klinikum Dortmund, Dortmund
,
David Bächinger
3   Klinik für Ohren-, Nasen-, Hals- und Gesichtschirurgie, Universitätsspital Zürich, SchweizZürich, Switzerland
,
Stefan Volkenstein
1   Klinik für Hals-Nasen-Ohrenheilkunde der Ruhr-Universität Bochum, St. Elisabeth-Hospital, Bochum, Bochum
,
Stefan Dazert
1   Klinik für Hals-Nasen-Ohrenheilkunde der Ruhr-Universität Bochum, St. Elisabeth-Hospital, Bochum, Bochum
,
Sönke Langner
4   Institut für Diagnostische and Interventionelle Radiologie, Kinder- und Neuroradiologie, Universitätsmedizin Rostock, Rostock
,
Robert Mlynski
5   Klinik und Poliklinik für Hals-Nasen-Ohrenheilkunde, Kopf- und Halschirurgie, “Otto Körner”, Universitätsmedizin Rostock, Rostock
,
Peter Roland
6   Department of Otolaryngology-Head and Neck Surgery and Neurological Surgery, University of Texas, Southwestern Medical Center, Dallas, Texas, USA, Dallas, United States
,
Anandhan Dhanasingh
7   MEDEL Elektromedizinische Geräte InnsbruckInnsbruck, Austria
› Author Affiliations
› Further Information
Also available at
 

Objectives Enlarged vestibular aqueduct (EVA) is a common finding associated with inner ear malformation (IEM). Furthermore, EVA can indicate the presence of syndromic diseases. However, uniform radiologic definitions for EVA are missing. This study evaluates VA-volume in different types of IEM and compares 3D-reconstructed VA-volume to 2D-measurements.

Methods 98 CT datasets from temporal bones were analyzed (56 with IEM; [cochlear hypoplasia (CH;n=18), incomplete partition type I (IPI;n=12) and type II (IPII;n=11) and EVA (n=15)]; 42 controls). VA-diameter was measured in axial images. VA-volume was analyzed by 3D-reconstruction. Inter-rater-reliability (IRR) was assessed using the intra-class-correlation-coefficient (ICC).

Results Significant differences in VA-volume between patients with EVA and controls (p < 0.0001) as well as between IPII and controls (p<0.0001) were found. VA diameter at the midpoint (VA midpoint) as well as at the operculum ( VA operculum) and VA volume showed weak to very strong correlations in IPI (VA midpoint: r=0.78, VA operculum: r=0.91), in CH (VA midpoint : r=0.59, VA operculum: r=0.61), in EVA (VA midpoint: r=0.55, VA operculum: r=0.66) and in controls (VA midpoint : r=0.36, VA operculum : r=0.42). Highest IRR was found for VA volume (ICC=0.90)

Conclusion VA diameter is an unreliable estimate of VA volume since (1.) measurement of VA diameter does not correlate well with VA volume and (2.) VA diameter shows a lower IRR than VA volume. VA volumetry provides new complementary information for the diagnosis of EVA and thus the clinical prognosis. The presented data suggest VA-volumetry to improve the diagnostic workup of isolated EVA and IEM. Consequently, an implementation into the diagnostic tools is recommended.



Publication History

Article published online:
24 May 2022

© 2022. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

Georg Thieme Verlag
Rüdigerstraße 14, 70469 Stuttgart, Germany