renal artery stenosis

atherosclerosis
- elderly males with risk factors (HTN, DM, smoking)
- ostial - proximal
fibromuscular dysplasia (FMD)
- females (5:1), youung to middle-aged
- mid - distal
neurofibromatosis
- kids (rare)
- ostial - proximal
congenital
post-irradiation
graft stenosis

affected kidney secretes renin ==> increased angiotensin
see: captopril renal scan