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a Histologic preparation of the tissue, which shows a deposit of calcium pyrophosphate dihydrate on the soft tissue (H&E ×40). b There was a cartilaginous matrix associated with the lesion (H&E ×200). c Photomicrograph of a deposit of calcium pyrophosphate dihydrate during disease. The rhomboid-shaped crystals were examined using polarized light with red plate. The crystals are bluish white (weak positive birefringence) (×400)
