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Purpose To analysis the diagnostic value of GFR measured by 99mTc-DTPA renal dynamic imaging to non-atherosclerotic renal artery stenosis (NA-RAS).Methods Case selection: The patients hospitalized in our hypertension department from Jan 2000 to Jan 2012,whose age <45,and whose renal function was measured by 99mTc-DTPA nephro-dynamic imaging,and whose diagnosis was confirmed by digital subtraction angiography(DSA).