Case Number 26: Massive cholesterol crystal deposition: unusual location in rheumatoid arthritis

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Figure 1.

Transverse ultrasound image. C, hypoechoic mass; T, tibia; TE, tibialis anterior tendon; L, medial collateral ligament.

Figure 2.

Differential interference contrast microscopic image of the plate-like crystals x40), typical of cholesterol monohydrate crystals.