Reversible acute renal failure with prolonged oliguria and gross hematuria in a case of paroxysmal nocturnal hemoglobinuria.

A 39-year-old man, a known case of paroxysmal nocturnal hemoglobinuria (PNH), developed severe acute renal failure, prolonged oliguria, and grossly bloody urine. After 8 weeks and 24 sessions of hemodialysis he became polyuric, and his renal function normalized after 10 weeks. The diagnosis of PNH was reconfirmed.