A 62-year-old man with diabetes mellitus type 2 and hypertension presents with acute kidney injury. His serum creatinine has risen from baseline 1.2 mg/dL to 3.8 mg/dL over 48 hours. Urine microscopy shows muddy brown casts and epithelial cell casts. Which of the following is NOT a typical feature of acute tubular necrosis (ATN)?

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