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Fig. 1C. —25-year-old woman with arterial hypertension (170 over 90 mm Hg) caused by fibromuscular dysplasia. Three-dimensional anteroposterior fast low-angle shot MR angiogram (3.8/1.49, 25° flip angle, 10-sec acquisition time, 1.5-mm partition thickness) of second measurement after power injection of contrast material revealed arterial (solid arrow) and venous (open arrow) enhancement. Note, in this later-phase image, areas of corrugation or "narrow string of beads," typical sign of fibromuscular dysplasia, are more visible and degree of stenosis appears to be more severe than in early arterial phase. This variability in degree of stenosis between phases might be potential pitfall of this method.





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