![]() EtiologyÄepending on the subtype, TOS is due to subclavian vein obstruction (in VTOS), subclavian artery compression (in ATOS) or lower trunk brachial plexus compression, scarring of scalene muscles, poor posture or a congenital anomaly (in NTOS). Below is a list of the component syndromes which comprise thoracic outlet syndrome along with a brief description of each. The outlet can be altered by exercise, trauma, pregnancy, a congenital anomaly, an exostosis, postural weakness or changes. Thoracic outlet syndrome (TOS) is the compression of nerves and blood vessels in the upper chest that travel to the arms through a passage called the. Mayo Clinic's experienced vascular surgeons are trained to provide a number of different surgical treatment options, depending on the cause of your thoracic outlet syndrome. Compression occurs when the size and shape of the thoracic outlet is altered. Patients are unable to maintain the position of opening and closing hands while arms are in an elevated position for 3 minutes (the Roos test). Thoracic outlet syndrome treatment may include medications, physical therapy or surgery. Clinical descriptionĬompression typically occurs at the interscalene triangle, the costoclavicular space between the first thoracic rib and clavicle, or the subcoracoid space beneath the pectoralis minor tendon causing pain, paresthesias and weakness in the upper extremities. Neurogenic TOS is the most frequently observed form accounting for 95% of all cases with 99% of these being disputed NTOS. The classic, most common symptoms are pain, numbness, and tingling that radiates below the shoulder down towards the hand and usually into the pinky and ring. ![]() This weakens the blood circulation in the neck, shoulder and arm. ![]() The diagnosis of TOS remains controversial so the true incidence is unknown. Thoracic outlet syndrome (TOS) is a condition in which there is compression of the nerves, arteries, or veins in the superior thoracic aperture, the passageway. Thoracic Outlet Syndrome (TOS) is a group of symptoms that occur when blood vessels or nerves in the space between your collarbone and your first rib (thoracic outlet) are squeezed. Thoracic outlet syndrome (TOS) occurs when the vessels and/or nerves running from the upper body to the arm become compressed, leading to swelling, reduced blood flow, tingling, weakness, pain and/or numbness in the neck, shoulder, arms or hands.
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