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Renal biopsy of a patient with oxalate nephropathy secondary to gastric bypass performed for carcinoma. On light microscopy, hematoxylin and eosin stain shows tubular acute necrosis (a, arrowhead) with numerous intratubular translucent calcium oxalate crystals (a,c, arrows). These crystals demonstrate birefringence under polarized light (b). Original magnification ×9.75 (a) and ×30 (c).
