1. Paget-Schroetter syndrome: Also called "effort thrombosis"
-Results from intermittent obstruction of vein during repetitive arm/shoulder movements
-Subclavian vein compressed between first rib, anterior scalene muscle, and clavicle
2. Primary subclavian venous thrombosis occurs in patients with hypercoagulable states
3. Secondary subclavian venous thrombosis results from venous injury (central lines, external trauma, pacemaker wires)