Early calcium pyrophosphate dihydrate (CPPD) arthropathy
Acute right knee pain, mild local tenderness, redness and hotness
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Single rounded hyper-echoic spot at the middle zone of intercondylar cartilage of the right femur.
Synovial fluid analysis revealed rhomboid crystals which are weakly positive birefringent under compensated polarized light. Diagnosis: Early CPPD