“…Sternal origin of first rib, under the clavicle, to base of coracoid Also associated with aberrant insertion of middle scalene onto dorsal aspect second rib Hyperabduction 33 Pectoralis minor compression Compression of brachial plexus and/or subclavian vessels on pectoralis minor tendon or coracoid due to shoulder hyperabduction SPHERE 34 Pancoast tumor (lung cancer) Superior vena cava syndrome, Pancoast tumor (due to superior lung cancer), Horner syndrome, endocrinopathy, recurrent laryngeal neuropathy, effusions (pleural, pericardial) "Dynamic" 35 Unknown Speculative etiology: active vigorous breathing in amateur marathon runner causing bilateral anterior and middle scalene hypertrophy, first rib elevation due to lung expansion, and gravitational pull on arms due to fatigue Dynamic 36 Axillary artery thrombosis MLB pitcher with axillary artery thrombosis (third part-proximal to posterior circumflex humeral artery) Dynamic 37 Innominate artery thrombosis MLB pitcher with innominate, subclavian, and carotid occlusion, with ischemic embolic stroke Dynamic 38 Subclavian vein thrombosis MLB pitcher with effort thrombosis, subclavian DVT, bilateral pulmonary emboli DVT indicates deep vein thrombosis; MLB, major league baseball.…”