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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 Ramsay Hunt syndrome with mastoid effusion on the left side. (A) Non-contrast axial T2-weighted image at the level of IAC and mastoid air cells shows high signal intensity from the fluid in the left mastoid suggesting mastoid effusion (dotted circle). (B) Post-contrast axial T1-weighted image at the Bill’s bar shows enhancement of the distal canalicular and labyrinthine segment of the left facial nerve (long arrow), and superior vestibular nerve (short arrow). The adjacent dura in fundic area of the left IAC and left posterior petrous ridge are also enhanced (arrowheads). (C) Post-contrast axial T1-weighted image at the level of IAC demonstrates mild enhancement of basal turn of the left cochlea and diffuse dural enhancement along the whole length of the left IAC and left posterior petrous ridge (arrow heads). Left auricle is thickened and enhanced (dotted circle) as compared with right side.