Which option is NOT a known compression site for thoracic outlet syndrome?

Which option is NOT a known compression site for thoracic outlet syndrome?

• A. Between tibia and fibula
• B. Between clavicle and first rib
• C. Between coracoid process and pec minor
• D. Between anterior and middle scalene muscles

Answer: (A)

Thoracic outlet syndrome involves compression of the neurovascular bundle as it passes from the thorax into the upper limb. The classic compression sites are the interscalene triangle between the anterior and middle scalene muscles, the costoclavicular space between the clavicle and first rib, and the space beneath the coracoid process where the pectoralis minor lies (between the coracoid process and the pec minor). The space between the tibia and fibula lies in the leg and has no relation to the thoracic outlet, so it is not a known compression site. Therefore, that option is not a known compression site for thoracic outlet syndrome.

Thoracic outlet syndrome involves compression of the neurovascular bundle as it passes from the thorax into the upper limb. The classic compression sites are the interscalene triangle between the anterior and middle scalene muscles, the costoclavicular space between the clavicle and first rib, and the space beneath the coracoid process where the pectoralis minor lies (between the coracoid process and the pec minor). The space between the tibia and fibula lies in the leg and has no relation to the thoracic outlet, so it is not a known compression site. Therefore, that option is not a known compression site for thoracic outlet syndrome.