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MRI sacroiliitis mimics.

Anne Grethe Jurik1,2, Robert G W Lambert3, Rosa Marie Kiil1,2

  • 1Department of Radiology, Aarhus University Hospital.

Current Opinion in Rheumatology
|April 30, 2026
PubMed
Summary
This summary is machine-generated.

Magnetic resonance imaging (MRI) helps detect sacroiliitis in axial spondyloarthritis (axSpA). Differentiating axSpA from mimics like anatomical variations is crucial for accurate diagnosis and treatment.

Keywords:
MRIdifferential diagnosissacroiliac jointsacroiliitisspondyloarthritis

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Area of Science:

  • Radiology
  • Rheumatology
  • Musculoskeletal Imaging

Background:

  • MRI of sacroiliac joints (SIJ) is key for diagnosing axial spondyloarthritis (axSpA).
  • Detecting early inflammatory and structural changes is vital for axSpA diagnosis.
  • Bone marrow edema (BME) on MRI can indicate sacroiliitis but also mimic other conditions.

Purpose of the Study:

  • To review and illustrate MRI features of common conditions mimicking axSpA sacroiliitis in adults.
  • To aid clinicians in differentiating axSpA from non-axSpA causes of SIJ abnormalities.

Main Methods:

  • Review of current literature on MRI findings in SIJ conditions.
  • Illustration of characteristic MRI features for axSpA and mimicking conditions.
  • Analysis of data-driven MRI lesion thresholds for axSpA specificity.

Main Results:

  • Anatomical SIJ variations can cause non-inflammatory BME that mimics sacroiliitis.
  • Non-inflammatory BME in strain-related conditions is typically anterior, while axSpA changes are more widespread.
  • Specific MRI lesion thresholds enhance differentiation of axSpA from mimics, except for osteitis condensans ilii and postpartum changes.

Conclusions:

  • Accurate and early axSpA detection is critical for effective treatment and research classification.
  • Misdiagnosis of sacroiliitis can lead to inappropriate patient management.