(A)Classic “chain of beads” angiographic appearance. (B)Transverse view at the level of the origin of the right renal artery. There is laminar flow in the proximal segment 1 cm (blue)beyond which flow is turbulent (multicolored mosaic pattern). (C)Intravascular ultrasound in the middle segment of the right renal artery, demonstrating a membrane (arrow). Ao = aorta.