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The natural history of renal artery stenosis (RAS) has been difficult to document because serial arteriography is rarely justified. Duplex scanning is a noninvasive technique that is ideally suited for both screening and follow-up of RAS. In this approach, renal arteries are classified as normal, <60% stenosis, =<60% stenosis, or occluded, and disease progression is defined as a change in the...
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