thoracic outlet compression syndrome

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tho·rac·ic out·let syn·drome

(TOS) (thōr-as'ik owt'lĕt sin'drōm)
Collective name for several conditions attributed to compromise of blood vessels or nerve fibers (brachial plexus) at any point between the base of the neck and the axilla; classified on the basis of the structure known or presumed to be compromised, and divided into two main groups: vascular and neurologic.
Synonym(s): costoclavicular syndrome, hyperabduction syndrome, thoracic outlet compression syndrome, Wright syndrome.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

thoracic outlet compression syndrome

, thoracic outlet syndrome,


A symptom complex caused by the compression of nerves and/or vessels in the neck, such as by the first rib pressing against the clavicle or entrapment of brachial nerves and vessels between the pectoralis minor muscle and the ribs. It is marked by brachial neuritis with or without vascular or vasomotor disturbance in the upper extremities. The practitioner must differentiate TOS from cervical disk lesions, osteoarthritis affecting cervical vertebrae, bursitis, brachial plexus injury, angina, lung cancer, and carpal tunnel syndrome.
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