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. 2018 Apr 17;5:106. doi: 10.3389/fmed.2018.00106

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Copyright © 2018 Khmelinskii, Regel and Baraliakos.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Magnetic resonance imaging (MRI) of the sacroiliac joints (same patient as depicted in Figure 1) demonstrates bilateral irregularity of the joint margins, and subchondral bone marrow edema appearing as a hypointense signal on T1-weighted (T1w) sequence (A) and as a hyperintense signal on short tau inversion recovery (STIR) sequence (B), fulfilling the Assessment of SpondyloArthritis Society criteria for positive MRI for sacroiliitis. An area of subchondral sclerosis with hypointense signal on both sequences (arrow), and an active erosion with hypointense signal on T1w sequence and hyperintense on STIR sequence (arrowhead), are visible in the left ilium.