Decisive for the evaluation for radiological interventional therapy of renal artery stenosis, are the morphologic diagnostic by Duplex sonography, non-invasive cross-sectional angiography and digital subtraction angiography in addition to the anamnesis and clinical constellation. A standardized diagnostic algorithm and an evidence-based indication status contribute just as importantly to improvement of outcome as the implementation of uniform peri-interventional measures and a structured procedure for angiography, percutaneous transluminal renoangioplasty and follow-up. The aim of this article is to provide a practical introduction for the current radiological management of renal artery stenosis.