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Figure 1: (a) Section showing the presence of bile pigment within tubular epithelial cells (white arrow) and rigid cast in one of the tubules with surrounding interstitial inflammation (H and E, ×400). (b) Section showing numerous tubules containing PAS negative-fractured casts, interstitial inflammation, interstitial fibrosis, and tubular atrophy along with two normal glomeruli (PAS, ×200). (c) Section showing characteristic giant cell reaction to myeloma casts (H and E, ×400). (d) Section showing negative Prussian blue reaction in bile pigment (Perl's stain × 400, black arrow)

Figure 1: (a) Section showing the presence of bile pigment within tubular epithelial cells (white arrow) and rigid cast in one of the tubules with surrounding interstitial inflammation (H and E, ×400). (b) Section showing numerous tubules containing PAS negative-fractured casts, interstitial inflammation, interstitial fibrosis, and tubular atrophy along with two normal glomeruli (PAS, ×200). (c) Section showing characteristic giant cell reaction to myeloma casts (H and E, ×400). (d) Section showing negative Prussian blue reaction in bile pigment (Perl's stain × 400, black arrow)