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AS, General aspects
AS, Sacroiliitis - radiography
AS, Sacroiliitis - MRI
AS, Spine - radiography
AS, Spine - MRI
AS, Spinal fractures
AS, Other joints
Other forms of SpA
Psoriatic arthritis
Reactive arthritis
Enteropathic arthritis
Undifferentiated SpA
Juvenile spondyloarthritis
General imaging aspects of axSpA

The imaging findings in axSpA may vary depending on the type of disease entities in accordance with the European classification criteria for seronegative spondyloarthropathies (DOI: 10.1002/art.1780341003), encompassing

  • Ankylosing spondylitis
  • Psoriatic arthritis
  • Reactive arthritis
  • Arthritis associated with inflammatory bowel disorders (enteropathic arthritis)
  • Undifferentiated spondyloarthritis

Additionally, there are atypical forms such as

  • Pustulotic arthro-osteitis / SAPHO (Synovitis, acne, pustulosis, hyperostosis, osteitis) / CNO (Chronic non-bacterial osteitis)

  • Juvenile spondyloarthritis

However, the features seen in ankylosing spondylitis (AS) often occur in the other forms of axSpA, which has established AS as a prototype. Emphasis has therefore been put on illustrating and explaining the typical changes in AS with a subsequent brief description of the slightly different changes that can be seen in the other SpA forms. A thorough description of clinical, biochemical as well as imaging findings in spondyloarthritis can be obtained in the Handbook elaborated by the ASAS (Assessment of SpondyloArthritis International Society) doi:10.1136/ARD.2008.104018.

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