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SIJ - differentials
OCI / postpartum changes
Strain-related SIJ changes
Degenerative / DISH changes
Infectious sacroiliitis
Fractures
Inflammatory conditions
Metabolic disorders
Tumors
Spine - differentials
Degenerative changes
Infectious spondylitis
SIJ differential diagnoses

Sacroiliitis as part of spondyloarthritis (SpA) has to be differentiated from disorders which may present with imaging features somewhat similar to those seen as part of axSpA changes. Differentials are especially important in the interpretation of the sSIJ because sacroiliitis is a hallmark for the diagnosis of axSpA changes (doi:10.3390/jcm12031039)

The most frequent differential diagnoses to axSpA sacroiliitis by MRI are:

  • Osteitis condensans ilii (OCI) and pregnancy-related changes

  • Other strain-related SIJ changes

  • Degenerative SIJ changes/osteoarthritis

  • Diffuse idiopathic skeletal hyperostosis (DISH)

  • Infectious sacroiliitis

  • Fractures (stress and insufficiency)

  • Inflammatory conditions

  • Metabolic disorders

  • Tumors

 
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