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Figure 1 (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.