thoracic outlet syndrome
Also written as: TOS — thoracic outlet syndrome
Compression of neurovascular structures in the thoracic outlet region, causing symptoms in the neck, shoulder, and arm of athletes.
Full Definition
Thoracic outlet syndrome (TOS) encompasses a group of conditions caused by compression of the neurovascular bundle (brachial plexus, subclavian artery, and subclavian vein) in the thoracic outlet region between the neck and armpit. In athletes, this condition is most commonly seen in overhead sports such as swimming, volleyball, and baseball, where repetitive overhead motions can lead to muscular hypertrophy and subsequent compression. There are three main types: neurogenic TOS (most common), arterial TOS, and venous TOS. Symptoms vary by type but may include neck and shoulder pain, arm numbness and tingling, weakness, and in vascular forms, swelling or discoloration. Diagnosis requires careful clinical evaluation as symptoms can mimic cervical radiculopathy or peripheral nerve entrapments. Conservative management emphasizes postural correction and strengthening, while severe cases may require surgical decompression.
Usage
Usage note: Specify subtype (neurogenic, arterial, or venous) when known for precise documentation.
In Context
- "The swimmer's arm numbness and weakness were attributed to neurogenic thoracic outlet syndrome." — Sports medicine consultation
- "Provocative testing was positive for thoracic outlet syndrome with reproduction of symptoms during elevated arm stress test." — Physical examination findings