CT scan or MRA may result in the clinician oversight of some of the more subtle findings. It is expensive and the availability is limited.

It is possible to evaluate RAS via angiogram, bet evaluation of the size of the stenosis tends to be imprecise. Additionally, angiography does not allow a cross-sectional assessment of the stenosis, and in the case of FMD, it is not possible to distinguish the different histological types, although intervention at the time of assessment is a possibility. Doppler sonography is able to measure the amount of blood flow, and is non-invasive. It tends to be highly invasive and is able to demonstrate problems with slow patterns and other issues which are highly suggestive of significant stenosis. Doppler ultrasound tends to be very operator dependent and the exam takes a significant amount of time. Additionally, the exam may be limited by abdominal girth, patient movement and...
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