IF Finding Sign String of Pearls aka String of Beads Angiography Fibromuscular Dysplasia (FMD) of the Renal Arteries String of Beads aka String of Pearls Angiography Fibromuscular Dysplasia (FMD) of the Renal ArteriesString of Beads String of PearlsAngiography of the aorta at the level of the renal arteries show multiple alternating areas of stenosis (narrowing) and dilation, giving the appearance of a string of beads or string of pearls sign, characteristic of FMD.Ashley Davidoff MD TheCommonVein.net 16064c