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. 2021 Apr 30;100(Suppl 1):S1–S43. doi: 10.1055/a-1349-3824

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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/).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 6 — Complete aplasia of the semicircular canals. Axial CT scan of the temporal bone with complete aplasia of the semicircular canals. a Bilateral hypoplastic cochlea. b On the right, a normal width of the cochlear aperture is found, on the left, the aperture is severely narrowed (arrow) – hypo- or aplasia of the cochlear nerve can already be assumed but MRI has to provide the evidence. c Narrow internal auditory canals (black arrows) are typical such as the bilateral comma-shaped vestibule (white V). d The semicircular canals cannot be displayed, the vestibular aqueduct (arrow) is the only narrow structure.