| Renal Vein Stenosis |
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| l | Grey Scale-
normal or hypoechoic |
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| l | Color Doppler-
aliasing at stenotic |
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| site |
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| l | Spectral
Doppler- 3 to 4 times |
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| increase in
velocity across the |
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| region
indicates a |
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| hemodynamically
significant |
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| stenosis. |
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