thoracic outlet syndrome
noun
: any of a group of disorders that are marked by the compression of nerves (such as the brachial plexus) or blood vessels (such as the subclavian artery or vein) as they pass from the neck toward the armpit or proximal arm through a space in the upper thorax between the clavicle and the first rib and that typically result in pain, numbness, weakness, or cold sensitivity in the affected area
In August his arm suddenly went numb; he was shelled in two appearances before doctors figured out he was suffering from thoracic outlet syndrome, a condition in which his first rib was pressing upon an artery.—Tom Verducci
The repetitive overhand motion done by weightlifters, gymnasts, swimmers and more, occasionally results in thoracic outlet syndrome …—Steve Wood
—abbreviation TOS
Cite this Entry
“Thoracic outlet syndrome.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thoracic%20outlet%20syndrome. Accessed 29 Mar. 2025.
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