Subclavian artery obstruction

The subclavian vein is a paired large vein, one on either side of the body, that is responsible for draining blood from the upper extremities, allowing this blood to return to the heart. The left subclavian vein plays a key role in the absorption of lipids, by allowing products that have been carried by lymph to enter the bloodstream, where it can enter the hepatic portal vein. [Source: Wikipedia ]

May Cause
Rib notching
May Be Caused by
Blalock-Taussig shunt