Presentation
Knee pain and swelling for two years.
Patient Data
Age: 25 years
Gender: Female
From the case:
Rheumatoid arthritis of the knee
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Sagittal T1

Diffuse hyaline articular cartilage thinning.
Thickened edematous knee synovium (synovitis).
Marked joint effusion.
Peripheral erosion of the posterior aspect of the medial tibial plateau.
Subchondral marrow signal changes.
Case Discussion
Clinical and radiologic data highly suggestive of rheumatoid arthritis. The diagnosis was clinically established shortly after.