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. 2020 Sep 15;7(4):667–684. doi: 10.1007/s40744-020-00234-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, which permits any non-commercial 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-nc/4.0/.

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Fig. 1 — a Typical findings of sacroiliac joint involvement in a patient with ankylosing spondylitis (AS), showing extensive sclerosis (thin arrow), pseudodilation (thick arrow), and partial ankylosis (asterisk). b Computed tomography of the sacroiliac joints of a patient with AS. Note the areas with erosions (arrows) and sclerosis (asterisk), which represent characteristic signs of the disease. c Typical osteodestructive changes seen as erosion (asterisk) and osteoproliferative changes seen as syndesmophytes (arrows) in the cervical spine of a patient with AS. Reprinted from Hochberg MC, et al. Rheumatology. 7th ed.

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