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Fig. 1 —Flow diagram illustrates reasons for exclusion, random assignment of patients to diagnostic test groups, diagnostic tests that patients actually underwent, schematic representation of follow-up, and actual number of patients included in analysis. Patients meeting all eligibility criteria were randomly assigned to undergo MR angiography (MRA) or currently used test, which was duplex sonography (DS) in three hospitals and CT angiography (CTA) in one hospital as initial imaging test. DSA = digital subtraction angiography. ^aSome patients underwent several interventional procedures. ^bThese patients did not undergo any diagnostic or therapeutic intervention and no data are available.