Indicated in patients with suspected secondary hypertension to rule out renal artery stenosis (RAS).
Atherosclerosis—Proximal vessel involvement
Fibromuscular dysplasia (FMD)—Distal vessel involvement; young females
Arteritis, Takayasu’s disease
Normal renal arteries arise anterolaterally from the branch of aorta.
Right renal artery arises at 10 o’clock position; passes posterior to IVC.
Left renal artery arises at 4 o’clock position; passes posterior to left renal vein.
B-mode—Comment on kidney size and parenchymal echotexture.
CDUS Scanning—Supine position to trace the origin of renal vessel.