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Renal histology. (A) Light microscopic findings showed that the glomeruli appeared normal in size and cellularity (×400). (B) Immunofluorescence findings showed positive staining for κ-light chain in the proximal tubules (×400). (C) Electron microscopy showed that the proximal tubules contained numerous rhomboid and rod-shaped, electron-dense crystals and lysosomes in the cytoplasm and tubular cast (×2,500).
