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. 2022 Sep 23;53(3):426–437. doi: 10.1007/s00247-022-05502-8

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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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Fig. 2 — Overall degree of inflammation in right-hip MRIs in four pairs of images from four children with juvenile idiopathic arthritis (JIA) across different levels of severity. All images are demonstrated using coronal post-contrast three-dimensional (3-D) gradient echo with fat saturation (a, c, e, g) and coronal fat-saturated T2-weighted turbo spin-echo (b, d, f, h) MRI sequences. a, b No inflammation (score 0) in a 12-year-old boy. c, d Mild synovial thickening with moderate increase in post-contrast enhancement (long arrows) and sliver of effusion (short arrows) (score 1) in a 16-year-old girl. e, f Moderate synovial thickening with moderately increased post-contrast enhancement (long arrows) and mild effusion (short arrows) (score 2) in a 15-year-old boy. g, h Severe synovial thickening and increased post-contrast enhancement, more evident at the medial aspect of the joint (long arrows), with mild/moderate effusion (short arrows) (score 3) in a 17-year-old girl