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. 2020 Jul 14;10:11580. doi: 10.1038/s41598-020-68456-7

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Findings compatible with chronic sacroiliitis on MRI of the sacroiliac joints. Source: the authors (2019). Coronal T1 sequence: bilateral reduction of the intra-articular space in the sacroiliac joints consistent with bone bridges (white arrows), and bilateral high signal intensity suggestive of fat metaplasia (blue arrows) (a). Coronal T1 sequence: low signal intensity bilaterally consistent with bone erosion (white arrows) and bone sclerosis (blue arrows) (b). Coronal T1 sequence: on the left high signal intensity consistent with fat metaplasia (white arrows) and low signal intensity suggestive of bone erosion (green arrows) and bone sclerosis (blue arrows); similar findings on the right, with lower signal intensity (c). Coronal STIR sequence: low signal intensity bilaterally consistent with bone erosion (white arrows) (d). R: right side , L: left side.