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. 2017 Apr 11;15:24. doi: 10.1186/s12969-017-0159-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Active sacroiliitis in a 16-year-old girl with juvenile spondyloarthritis according to global assessment as well as to the ASAS definition of a positive MRI for sacroiliitis. a Semicoronal STIR image shows two small, focal spots of BME at the sacral and iliac side of the right sacroiliac joint (arrows). b Follow-up MRI 6 months later shows more extensive active sacroiliitis with bilateral high signal in the joint space and an active lesion with surrounding BME at the sacral side of the left sacroiliac joint (arrows). c Corresponding semicoronal fat-saturated T1-weighted image of the follow-up MRI shows bilateral enhancement of the synovium (synovitis) and of the active lesion on the left side (arrows)