Which of the following is not a known site of thoracic outlet compression?

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The condition known as thoracic outlet compression involves the brachial plexus and/or the subclavian vessels being squeezed as they pass from the thorax to the upper limb. The classic sites where this compression occurs are the interscalene space between the anterior and middle scalene muscles (the scalene triangle), the space between the clavicle and the first rib (costoclavicular space), and the space beneath the pectoralis minor as it passes under the coracoid process (subcoracoid/pectoralis minor space). The supraclavicular fossa sits above the clavicle and does not form a tunnel through which the neurovascular bundle travels for thoracic outlet compression, so it is not a recognized site of compression.