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. 2020 Aug 26;50(3):531–541. doi: 10.1007/s00256-020-03588-5

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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 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. 3 — Detailed view of representative MRI findings in PsA and RA. Transversal T1w fat-saturated contrast-enhanced sequences of selected MCP joints of three patients each with PsA (a–c) and RA (d–f). a 34-year-old male. Severe periarticular inflammation (white arrow) with additional mild synovitis (open arrow). b 42-year-old female. Severe dorsal periarticular inflammation (white arrow) with synovitis (open arrow). c 44-year-old female. Severe periarticular inflammation (white arrow) with corresponding mild flexor tenosynovitis (arrowhead). d 39-year-old male. Widespread synovitis (white arrow) with moderate flexor tenosynovitis (arrowhead) and large bone erosion (white arrow). e 41-year-old male. Multiple large bone erosions (white arrow) and severe synovitis (open arrow) with mild flexor tenosynovitis (arrowhead). f 56-year-old female. Bone erosion (white arrow) with moderate flexor tenosynovitis (arrowhead) and moderate synovitis (open arrow). Note the absence of periarticular inflammation in d–f despite significant inflammatory joint changes at the joint level