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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
Infectious sacroiliitis

Infectious sacroiliitis is a relatively rare condition usually presenting with low back or buttock pain with concomitant elevated CRP, but not always fever.

The imaging changes are mostly unilateral and by MRI present as extensive BME and concomitant contrast enhancement. There is usually concomitant thickened distended inflamed capsule, joint fluid accumulation and edema in the surrounding soft tissue, sometimes with avascular fluid collections (abscesses), doi:10.2214/AJR.14.14217; doi:10.1007/S002560000242. In contrast, the typical inflammatory SIJ changes in axSpA do not cross anatomic borders and are limited to the bone and intraarticular space.

Radiograph showing blurred joint facets corresponding to the left sacroiliac joint.

MRI, semi-coronal T1, STIR and postcontrast T1FS and semi-axial postcontrast T1FS image. There is suppression of the fat signal around the left SIJ and erosion of the iliac joint facet on the T1 image with pronounced oedema and enhancement on the STIR and T1FS + Gd. image, respectively, involving both the joint region and the surrounding soft tissue structures. The soft tissue involvement is best seen on the semi-axial slice. There are no detectable abscesses.

 
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