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A form of thoracic outlet syndrome that manifests as unilateral (rarely bilateral) arm pain and cyanosis. The disease occurs in young adults, usually after excessive arm activity. The characteristic symptoms, caused by venous obstruction, are arm swelling, cyanosis and pain. Repetitive arm motion and compression of the subclavian vein in the neck (between the clavicle and the first rib) leads to scar tissue that can predispose to thrombosis due to narrowing of vessels.
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