A case of acute renal failure due to rhabdomyolysis in which myoglobin casts were confirmed in the urinary sediment—Meaning of evaluation of myoglobin casts similar to granular and waxy casts—

Abstract

Acute renal failure resulting from rhabdomyolysis is caused by the release of myoglobin into the circulation, leading to tubular epithelial cell injury or tubular lumen obstruction by myoglobin casts. Morphologically, myoglobin casts are similar to granular and waxy casts, and are difficult to distinguish by urine sediment analysis. In the diuretic phase of myoglobinuric acute renal failure, myoglobin casts may be contained in granular and waxy casts. We describe a case of myoglobin casts contained in waxy casts in the diuretic phase of acute renal failure resulting from rhabdomyolysis.