The distinction between "active sacroiliitis" and "likely sacroiliitis" on an MRI report is actually really important — and worth discussing with your rheumatologist directly.
"Active sacroiliitis" means the MRI has detected clear signs of current inflammation in the sacroiliac joints. This can include:
- Bone marrow Show Full Answer
The distinction between "active sacroiliitis" and "likely sacroiliitis" on an MRI report is actually really important — and worth discussing with your rheumatologist directly.
"Active sacroiliitis" means the MRI has detected clear signs of current inflammation in the sacroiliac joints. This can include:
- Bone marrow swelling (edema)
- Bone inflammation (osteitis)
- Soft tissue inflammation around joint attachments (enthesitis)
- Synovitis (inflammation of the joint lining)
This finding carries significant clinical weight and can support a confirmed diagnosis of axial spondyloarthritis. "Likely sacroiliitis" is more cautious language. MRI isn't perfectly specific — inflammatory changes from other causes can look similar, and normal structures can sometimes be misread as inflammation (known as a false-positive result).
This is why a spondylitis diagnosis is never based on imaging alone. Doctors combine MRI findings with:
- Blood tests (like HLA-B27)
- Physical examination
- Your reported symptoms
The terminology used in your MRI report shapes how urgently treatment may be considered, so it's worth asking your rheumatologist exactly what the wording means for your specific situation.
May 4
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