A Rare Case of Tumoral Calcium Pyrophosphate Dihydrate Crystal Deposition Disease of the Wrist Joint

Figure 6

Photomicrograph of the tumoral mass shows deposits of crystals surrounded by fibroblasts, macrophages, and foreign body-type giant cells (H&E, (a) low-power view, (b) high-power view). Under polarized light, the calcified deposits show weekly positive birefringence suggestive of CPPD ((c) low-power view, (d) high-power view).