Mysterious Crystals in an RA Patient’s Elbow

A patient with rheumatoid Arthritis has an elbow effusion. Aspiration reveals unique rectangular, platelike crystals. What is the diagnosis?

Cholesterol


What are these crystals that were aspirated from the bursa of an elbow of a patient with rheumatoid arthritis?

What is the most likely diagnosis?

Cholesterol
Calcium apatite
Calcium oxalate
Calcium pyrophosphate dihydrate
Monosodium urate

Bursitis, Cholesterol, Crystals, Rheumatoid arthritis, Synovial Fluid Analysis

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