Pulmonary embolism following an undiagnosed Paget-Schroetter syndrome: a case report and review of the literature.

Paget-Schroetter Syndrome (PSS) is a rare condition characterized by spontaneous thrombosis of the axillary-subclavian vein that occurs predominantly in young athletes engaged in repetitive overhead upper extremity motion, for instance, weightlifting, swimming, baseball, and tennis. PSS is usually a consequence of chronic repetitive microtrauma to the vein intima due to compression of the axillary-subclavian vein by the thoracic outlet structures. This chronic injury can then be acutely exacerbated by vigorous exercise done over a brief period, accelerating thrombus formation.