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Light microscopy. (A) No specific findings in the cortex (periodic acid-schiff [PAS], ×400). (B) Acute tubular injury in the medulla (PAS, ×400). (C) Neutrophilic peritubular capillaritis in medulla compatible to PTC grade 3 (PAS, ×400). (D) Interstitial hemorrhage in the medulla (H&E, ×200).
