Rheumatoid arthritis of the knee
Knee pain and swelling for two years.
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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.
Clinical and radiologic data highly suggestive of rheumatoid arthritis. The diagnosis was clinically established shortly after.