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Regarding fibromuscular dysplasia, all are true except:

a. This focal thickening results in luminal stenosis and decreased vascular flow
b. Focal irregular thickening in the walls of medium and large muscular arteries
c. Occurs most frequently in young - middle aged men
d. When involving the renal arteries leads to renovascular hypertension
e. It is basically a combination of medial and intimal hyperplasia with fibrosis