Ankylosing spondylitis (MRI)

Case contributed by Dr Patsy Robertson


Back pain.

Patient Data

Age: 50 years
Gender: Female

Sacroiliac joints show bilateral sacroiliitis with patchy bilateral subchondral bone marrow edema more marked on the right and on the sacral side of the joint. There is enhancement of both sacroiliac joints with extensive ilial side sclerosis. Fat deposition is present at a number of sites.


Findings are those of a spondyloarthropathy affecting the spine and sacroiliac joints with bone marrow edema and enhancement indicating active disease.


Bilateral New York criteria grade 3 changes with definite erosions, widening of the joints and sclerosis most marked on the ilial side.

Case Discussion

Plain films and MRI findings of sacroiliitis from ankylosing spondylitis. Contrast imaging was done in this case but is usually not required for the assessment of sacroiliitis unless there is concern regarding infection.

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