Thoracic Outlet Syndrome

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The term thoracic outlet syndrome (TOS) is given to a group of disorders that occur when blood vessels or nerves in that space are compressed. The thoracic outlet is what occupies the space between the ribs and the collarbone. Depending on which structure is affected, you can feel pain, swelling, numbness, blood clots, or skin discoloration in the neck, shoulder, arm, or hand.

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