Monday, 29 August 2016
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why does muddy brown cast in acute tubular necrosis appear brown ?
Muddy brown casts of ATN are also known as heme-granular casts. There is likely some staining of the cast by hemoglobin released in to the urine when red cells leak in to the renal tubule as a response to injury.

That would be my best hypothesis.

Dr. Jordan Weinstein
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