text: <unk>  <unk>  is defined as the unilateral or bilateral progressive narrowing of the renal<unk> es or their proximal branches of more than 50% in diameter.<unk>  is a heterogeneous group of diseases that most commonly include: fibromuscular dysplasia (FMD) and atherosclerotic<unk>  (ARAS).
  Although<unk>  may be an isolated asymptomatic condition,
  It may commonly lead to secondary hypertension that is thus called renovascular hypertension (RVHT), ischemic nephropathy, and chronic renal insufficiency.
  Approximately 90% of<unk>  cases occur due to progressive atherosclerosis.
  The ostium and proximal third of the renal<unk> es are the most commonly involved regions in atherosclerosis.
  Segmental and diffuse atherosclerosis may still be seen in the minority of patients, especially in context of chronic kidney disease and poor renal survival.
option_0: Renal artery stenosis
option_1: Renal amyloidosis
option_2: Polycystic kidney disease
option_3: Renal vein thrombosis
option_4: Hypertensive nephropathy
option_5: Renovascular disease
option_6: Renal cell carcinoma
option_7: Renal oncocytoma