Captopril renogram showing decreased flow to the right kidney (red squares, upper graph) compared with the left (yellow circles, upper graph) with decreased function of the right kidney (green triangles, lower graph) compared with the left (yellow circles, lower graph), suggesting right renal artery stenosis. Digital subtraction angiography confirms stenosis of the right renal artery origin (dashed arrow), which improved following stent placement (arrowhead).
