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. 2021 Feb 4;11:3127. doi: 10.1038/s41598-021-82984-w

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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A representative case of Bell’s palsy with sclerotic mastoid. (A) Non-contrast axial T2-weighted image at the level of IAC shows heterogeneous high signal intensity in the mastoids (dotted circle) which have similar signal intensity from the adjacent clivus and petrous apex (arrows), suggesting bony sclerotic change. (B) Temporal bone CT confirms bony sclerotic change and decreased number of mastoid air cells. (C) Post-contrast axial T1-weighted image at the Bill’s bar shows enhancement of the distal canalicular, labyrinthine, genu and proximal tympanic segment of the right facial nerve (arrows).