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. 2020 Sep 24;25(2):e318–e327. doi: 10.1055/s-0040-1715149

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Fundação Otorrinolaringologia. 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 commecial 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. 2 — Computed tomography scan of temporal bone. Axial view at the level of the cochlear basal turn, with a pericochlear hypodensity surrounding the cochlear turns, determining the “double ring sign”, typical of retrofenestral otosclerosis. Source: the authors.