Common compression sites for thoracic outlet syndrome include which of the following?

Common compression sites for thoracic outlet syndrome include which of the following?

• A. Between clavicle and first rib; anterior and middle scalenes; or coracoid process and pec minor
• B. Between femur and pelvis
• C. Behind the ear
• D. In the lower back

Answer: (A)

Compression in thoracic outlet syndrome happens where the brachial plexus and/or the subclavian vessels are squeezed as they pass from the neck toward the arm. The most common sites are: between the clavicle and the first rib, where the costoclavicular space can tighten the vessels and nerves especially with poor posture or arm elevation; between the anterior and middle scalene muscles, in the interscalene triangle, where scalene muscle tightness or anomalies can press on the upper brachial plexus; and beneath the coracoid process where the pectoralis minor tendon crosses, known as the subcoracoid or costopectoral space, where pec minor tightness or scapular positioning can compress the neurovascular bundle. The other locations listed—behind the ear, between the femur and pelvis, or in the lower back—are not typical sites of thoracic outlet compression.

Compression in thoracic outlet syndrome happens where the brachial plexus and/or the subclavian vessels are squeezed as they pass from the neck toward the arm. The most common sites are: between the clavicle and the first rib, where the costoclavicular space can tighten the vessels and nerves especially with poor posture or arm elevation; between the anterior and middle scalene muscles, in the interscalene triangle, where scalene muscle tightness or anomalies can press on the upper brachial plexus; and beneath the coracoid process where the pectoralis minor tendon crosses, known as the subcoracoid or costopectoral space, where pec minor tightness or scapular positioning can compress the neurovascular bundle. The other locations listed—behind the ear, between the femur and pelvis, or in the lower back—are not typical sites of thoracic outlet compression.