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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The most important sign of significance of renal artery stenosis on an angiogram is –
assistant
The correct answer is  The presence of arterial collaterals indicates that renal artery stenosis is hemodynamically significant. The diameter of stenotic segment may also give an indication of hemodynamic significance, but is only reliable if the stenosis is either very severe or minimal .