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From the case:
Ankylosing spondylitis
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Symmetrical sacroiliac joint fusion due to ankylosing spondylitis.
Case Discussion
This case was donated to Radiopaedia.org by Radswiki.net.
The images are from Dr. John Hunter's amazing MSK collection.
Dr. John Hunter is a professor in the department of radiology (musculoskeletal section) at UC Davis School of Medicine