PMC6297111_01
Amyloid deposits in the glomeruli stained red with Congo red show the characteristic apple green birefringence under polarized microscopy. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
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PMC6297111_01_gr1.jpg
fig1
She underwent a renal biopsy which revealed acute tubular necrosis and secondary (AA) amyloidosis with the classic apple green birefringence when stained with Congo red (Fig. 1) and positive immunohistochemical stain for serum amyloid A protein (Fig. 2).