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Figure 1: (a and b) Hematoxylin and eosin stain demonstrates deposition of amorphous acellular eosinophilic material in the interstitium, blood vessels, and muscle spindles (black arrows). (c and d) Congo red-stained section visualized under polarized light confirms the apple-green birefringent deposits to be amyloid (black arrows)

Figure 1: (a and b) Hematoxylin and eosin stain demonstrates deposition of amorphous acellular eosinophilic material in the interstitium, blood vessels, and muscle spindles (black arrows). (c and d) Congo red-stained section visualized under polarized light confirms the apple-green birefringent deposits to be amyloid (black arrows)