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. 2022 Mar 2;12:3436. doi: 10.1038/s41598-022-07471-2

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© The Author(s) 2022

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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Endoscopic images of the porcine Eustachian tube (ET) in the control and sirolimus-eluting cobalt–chrome alloy stent (SES) groups. (a) Baseline endoscopic image was obtained before stent placement showing the nasopharyngeal orifice (arrowheads) of the ET. (b) Endoscopic image obtained immediately after stent placement showing the placed stent into the ET. Observed touch bleeding due to the metallic guiding sheath (arrows). (c) Endoscopic image obtained 4 weeks after stent placement showing mucus accumulation (arrowhead) around the stent. (d) Endoscopic image showing the stent that could not maintain the round shape (arrows).