Possible renal artery stenosis.A low-pitched blowing sound in the upper midline area could indicate a renal artery bruit, which is a sign of renal artery stenosis. Renal artery stenosis is a narrowing of the renal artery, often due to atherosclerosis, which can lead to decreased blood flow to the kidneys. A renal artery bruit may be auscultated over the renal arteries and is indicative of turbulent blood flow through the narrowed artery.