[Paroxysmal Nocturnal Hemoglobinuria: A Rare but Treatable Cause of Acute Kidney Injury. Case Report].

Early recognition of acute kidney injury is essential to prevent progression to chronic kidney disease. We present the case of a 19-year-old man with multiple emergency department visits for fatigue, abdominal pain, and intermittent dark urine. Upon admission, he had pancytopenia with elements suggestive of hemolysis and acute kidney injury.