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Fig. 3B. —56-year-old man with arterial hypertension (175 over 95 mm Hg) and suspected renal artery stenosis. This case shows disagreement regarding grading of stenosis with contrast-enhanced MR angiography and digital subtraction angiography. Three-dimensional anteroposterior fast low-angle shot MR angiogram (3.8/1.49 [TR/TE], 25° flip angle, 10-sec acquisition time, 1.5-mm partition thickness) of first measurement after power injection of contrast material followed by saline solution reveals significant stenosis (arrow) of left renal artery (mean value of all four observers was 73%; range, 60-90%). Degree of stenosis was confirmed on additional views (not shown). Note significant stenosis in right renal artery (mean value of all four observers was 68%; range, 63-77%). Contrast-enhanced MR angiography overestimated both stenoses significantly.

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