Which symptom would most strongly suggest thoracic outlet syndrome over cervical myelopathy?

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Thoracic outlet syndrome shows symptoms that are tied to position and activity of the shoulder girdle. When neurovascular structures are compressed as they pass through the thoracic outlet, the resulting numbness or paresthesias in the upper limb often appear or worsen with certain arm positions (like raising or extending the arm) and can improve when the arm is lowered or repositioned. Cervical myelopathy, by contrast, stems from cervical spinal cord compression and tends to produce signs that involve both the arms and legs, with gait changes, increased reflexes, and even autonomic symptoms in more advanced disease. So, upper limb numbness that is clearly aggravated by arm position is most characteristic of thoracic outlet syndrome. The other options describe symptoms more typical of issues affecting the lower body or cranial nerves, which would point away from TOS.