Which is the most impoant sign of significance of renal aery stenosis on an angiogram?
Correct Answer: Presence of collaterals
Description: The most impoant sign of significant renal aery stenosis on an angiogram is presence of bridging collaterals. Other signs of hemodynamically significant aerial stenosis are post stenotic dilation, pressure gradient >10mmHg or ipsilateral renal vein renin hypersecretion. Ref: Essentials of Surgery: Scientific Principles and Practice By Lazar J. Greenfield, page 560; Computed Body Tomography With Mri Correlation, Volume 1 By Joseph K. T. Le page 1288
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