24 hours after admission to hospital for a sickle cell crisis, a 19-year-old man suddenly develops flank pain and red urine. Laboratory studies show:
Creatinine 1.2 mg/dL
Blood urea nitrogen 18 mg/dL
Urine RBC Many
Urine WBC Rare
Urine protein None
Which of the following is the most likely cause of hematuria in this patient?
Acute tubular necrosis
Diffuse cortical necrosis
Interstitial nephropathy
Focal segmental glomerulosclerosis
Nephrolithiasis
Renal papillary necrosis
