Granular Casts in urine sediment are most closely associated with which condition?

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Multiple Choice

Granular Casts in urine sediment are most closely associated with which condition?

Granular casts reflect injury to the renal tubules. In acute tubular necrosis, tubular epithelial cells are damaged and slough off, mixing with Tamm-Horsfall protein to form muddy brown granular casts that are shed into the urine. This pattern points to intrinsic tubular damage, distinguishing it from dehydration (which tends to show hyaline casts), glomerulonephritis (often RBC casts), or pyelonephritis (often WBC casts). So the presence of granular, especially muddy brown, casts is most closely linked to acute tubular necrosis.

Granular casts reflect injury to the renal tubules. In acute tubular necrosis, tubular epithelial cells are damaged and slough off, mixing with Tamm-Horsfall protein to form muddy brown granular casts that are shed into the urine. This pattern points to intrinsic tubular damage, distinguishing it from dehydration (which tends to show hyaline casts), glomerulonephritis (often RBC casts), or pyelonephritis (often WBC casts). So the presence of granular, especially muddy brown, casts is most closely linked to acute tubular necrosis.

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