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Grade 2 stenosis overestimated with spiral CT angiography.
A, Oblique DSA image shows grade 2 stenosis in the left internal carotid artery.
B, Elliptic centric contrast-enhanced MR angiogram shows the same findings.
C and D, Spiral CT angiograms show type 4 calcification. In this case, the stenosis was overestimated (grade 3) because of the difficulty in separating calcium from the contrast material.
