FIBROMUSCULAR DYSPLASIA - Idiopathic, segmentary, non inflammatory, non atherosclerotic - All layers of small and medium sized arteries involved - 4-6% prevalence in renal arteries and 0.3-3% in cervico-encephalic arteries - In more than half the cases, lesions are bilateral - Branch or bifurcation involvement also seen -Multifocal string of beads lesions seen in 84% of the cases -Almost any artery can be involved including mesenteric, brachial and iliac
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