Which symptom profile is typical of thoracic outlet syndrome?

• A. Diffuse arm pain at night with paresthesias and weakness exacerbated by overhead movement
• B. Localized leg pain worsened by standing
• C. Isolated numbness in fingertips only at rest
• D. Nocturnal leg cramps

Answer: (A)

Thoracic outlet syndrome occurs when the neural and/or vascular structures that run from the neck to the arm are compressed as they pass through the thoracic outlet, usually between the scalene muscles and the first rib or under the clavicle. Because nerves are irritated by this compression, the classic presentation is upper-extremity symptoms that are triggered by positions that narrow the outlet, especially overhead or sustained arm elevation, and can disturb sleep.

The described pattern—diffuse arm pain that awakens the patient at night, with numbness/tingling (paresthesias) and weakness, and that is worsened by overhead movement—fits neurogenic thoracic outlet syndrome. Neurogenic TOS is the most common form and manifests as pain, paresthesias, and sometimes weakness in the arm or hand, often bilateral or on the side of the scalene or first rib compression, with symptoms that are reproducible when the arm is raised or placed in an aggravating posture.

Other options don’t align with thoracic outlet syndrome because they point to conditions affecting other regions or nonpostural symptoms—leg pain worsened by standing suggests a lower-extremity issue; isolated numbness in fingertips only at rest is less characteristic of thoracic outlet involvement, which is typically activity- or posture-related; nocturnal leg cramps indicate a leg muscle or electrolyte issue rather than thoracic outlet pathology.