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AApo AI/AII/AIV. (A) This case of AApo AI shows diffuse medullary interstitial amyloid deposits, which stain silver negative. (B) This case of AApo AIV reveals diffuse medullary interstitial amyloid deposits that stain strongly Congo red positive. (C) The Congo red stained sections from the case shown in B exhibit apple-green birefringence when viewed under polarized light. AApo AI/AII/AIV, Apo AI, Apo AII, or Apo AIV amyloidosis. Original magnification, ×100.
