An 18-year-old paratrooper complained of tingling in his fingers when he elevated his arms to deploy his parachute. A subclavian arteriogram with the left arm in neutral position (A) shows a patent left subclavian artery. Repeat arteriogram with the arm elevated (B) shows an abrupt cutoff of the subclavian artery (arrowhead) with delayed distal filling of the axillary artery (arrow) via multiple small collateral arteries. His symptoms were reproduced with arm elevation.
