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  • Title: Calcium pyrophosphate dihydrate deposition disease: morphological and microanalytical features.
    Author: Keen CE, Crocker PR, Brady K, Hasan N, Levison DA.
    Journal: Histopathology; 1991 Dec; 19(6):529-36. PubMed ID: 1786937.
    Abstract:
    The light microscopic and polarization appearances of calcium pyrophosphate dihydrate crystal deposits in tissues are reviewed. In routine sections haematoxylinophilic crystalline deposits with a feathery or brush-like pattern are typical of calcium pyrophosphate dihydrate. Short rhomboidal crystals showing positive birefringence are seen on polarization; X-ray microanalytical and infrared spectroscopic data support the specificity of these appearances. The appearances of the crystal deposits in decalcified specimens are also described. We include six cases of calcium pyrophosphate dihydrate deposition within periarticular bone; to the best of our knowledge this has not previously been described.
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