Renal artery embolism. A 47-year-old female with a history of atrial fibrillation presented with acute left flank pain and massive hematuria. Coronally reformatted post-contrast abdominal CT image demonstrates endoluminal embolus within the left renal artery (arrows). There was also a large parenchymal infarct area (arrowheads) in the upper pole of the left kidney