Images in a 58-year-old man with mesenteric ischemia. (a) Anteroposterior conventional angiogram shows moderate (estimated as 60%) stenosis (black arrow) in the right renal artery and mild (estimated as 40%) stenosis (white arrow) in the left renal artery. (b) Coronal MIP image shows hyperattenuating calcification (arrow) in the origin of the left renal artery that was overestimated by both MIP readers as stenosis greater than 70%. (c) Coronal VR image (posterior projection) was edited with a clip plane to remove a portion of the hyperattenuating calcification (arrow) in the left renal artery. Stenosis was correctly categorized by one VR reader as mild and was overestimated by the other as greater than 70%.
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