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. 2023 Dec 18;11(1):19–34. doi: 10.1007/s40744-023-00627-0

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, which permits any non-commercial 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-nc/4.0/.

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Fig. 1 — MRI of sacroiliac joints of a 38-year-old male patient with inflammatory back pain for years, HLA-B27 positivity and elevated CRP. A STIR sequence shows subchondral bone marrow edema and a subchondral cyst or an erosion localized in the mid part of the joint (arrow). B T1-weighted sequence demonstrates erosions with fat metaplasia in the erosion cavity (backfill)—bold arrow, as well as a fat lesion (thin arrow) and sclerosis (dotted arrow). C The erosion-sensitive sequence (VIBE) confirms the presence of erosions (arrows). CRP C-reactive protein, MRI magnetic resonance imaging, STIR short tau inversion recovery, VIBE volumetric interpolated breath-hold examination. Poddubnyy D. Joint Bone Spine 2023 Jan;90(1):105,468.

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