![]() ![]() Women are generally more affected than men by the disorder. The neurovascular compression can result from a variety of causes (see Table). 2 Causes of CompressionĬompression sites generally include the interscalene triangle, costoclavicular space, or pectoralis minor muscle. The subclavian vein travels the same course except it passes anterior to the anterior scalene muscle. ![]() 3 The subclavian artery and brachial plexus arch over the first rib between the anterior and middle scalenes, then pass under the clavicle and subclavian muscle, then travel under the pectoralis minor muscle and into the axilla. The thoracic outlet is the triangular shaped channel through which the nerves and vessels of the arm leave the neck and thorax. Other clinical terms used to describe this presentation include the scalenus anticus, costoclavicular, hyperabduction, pectoralis minor and cervical rib syndromes. ![]() 1,2 Symptoms will vary according to the severity of the compression. Symptoms of TOS may include upper extremity pain, paresthesias, numbness, muscle weakness, sensation of heaviness, discoloration, edema, arm fatigue, ulceration and gangrene. Thoracic outlet syndrome (TOS) is a collection of syndromes resulting from abnormal compression of the brachial plexus and/or the subclavian artery/vein (neurovascular bundle) that occurs between the cervical spine and the axilla. Tests can be effective in diagnosing this sometimes confounding condition Evaluation and Treatment for Thoracic Outlet Syndrome ![]()
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