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. 2022 Feb 23;51(9):1721–1730. doi: 10.1007/s00256-022-04018-4

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© The Author(s) 2022

Open AccessThis 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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Fig. 1 — Sacroiliitis—findings typical for axSpA. The radiography (CR) shows sclerosis and erosions (arrows) in the right SIJ whereas the left SIJ appears normal. T1w-MRI additionally reveals fatty marrow metaplasia (arrow) and erosion (arrowheads) in the right SIJ; and STIR displays inflammatory bone marrow lesions (arrows) bilaterally, especially in the left SIJ, as well as inflammation within the joint space (arrowheads) bilaterally. Computed tomography (CT) depicts erosions and sclerosis with high resolution (arrow) but cannot detect active bone marrow inflammation. In the left SIJ, CT shows only a slight erosion of the iliac cortical surface and mild sclerosis (arrowhead). All three modalities are typical for sacroiliitis caused by axial spondyloarthritis (axSpA)