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Kidney biopsy. (A) Periodic acid–Schiff stain (× 400), normal glomerulus without crescent, spikes and holes, or basement membrane reduplication and acute tubular injury. No tubulitis was seen. (B) Ultrastructural examination shows extensive foot process effacement with microvillous transformation. (C) Tubuloreticular inclusion noted in capillary loop endothelial cells (white arrowhead). CL, capillary lumen; EM, electron microscopy; PAS, periodic acid–Schiff stain; US, urinary space.
