ABSTRACT
The thoracic outlet syndrome is a constellation of neurovascular symptoms resulting from compression at the thoracic outlet. Ninety-five percent of thoracic outlet syndromes result from neurologic symptoms usually from compression of the lower roots of the brachial plexus. Only 5% of the thoracic outlet syndrome is vascular in etiology. The brachial plexus consists of input from C5, C6, C7, C8 and T l. The most common cause of the thoracic outlet syndrome results from com pression of the lower roots of the brachial plexus, i.e., the ulnar distribution con tributed to from C8 and T l.
