stenosis or stricture is an abnormal narrowing in a blood vessel or other tubular structure in the body.

When the stenosis occurs in a blood vessel, the blood passing through the stenosis will have a turbulent flow.  The sound of this turbulence can often be picked up on a stethoscope, but most are confirmed through the use of some form of medical imaging.

A stenosis can have several causes.  Atherosclerosis is the most common, but diabetes mellitusinfectioninflammationischemia and smoking can all be causes.  

Stenosis at Wikipedia

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