Thoracic Outlet Syndrome (TOS)
TOS is caused by compression of nerves or blood vessels, or both, as a result of trauma, disease or congenital deformity in the thoracic outlet between the clavicle and first rib. Treatment begins with exercises to stretch and open the tissues associated with the thoracic outlet. If symptoms persist, surgery is an option. The surgeon makes an incision above the clavicle and removes scalene muscles, along with the first rib, easing pressure on the brachial plexus nerves. About 80 percent of patients experience complete resolution of symptoms; 20 percent report significant improvement.