Pigmented "muddy brown" granular cast is characteristic of
AKI from ATN due to ischemic injury, sepsis, or ceain nephrotoxins has characteristic urine sediment findings: pigmented "muddy brown" granular casts and tubular epithelial cell casts. These findings may be absent in more than 20% of cases Ref: Harrison 19e pg: 1805
Prerenal ARF
Ischemic or nephrotoxic ATN
Postrenal ARF
Chronic renal failure
Kidney