Emboli to the renal arteries occurs most often in patients with underl
ying cardiac disease. Hematuria is a common feature of renal infarctio
n, but the finding of erythrocyte casts in cases of renal infarction h
as not been commonly reported. We report a case of renal artery emboli
zation in a patient who had transient nephritic urine sediment, and re
view the significance of this finding.