II. Mechanism

  1. Space between clavicle and first rib narrowed
    1. Prolonged downward and backward Shoulder pressure
    2. Example: Heavy backpack on Shoulders
  2. Worsened by abnormal clavicle
    1. Malunion or nonunion Clavicle Fracture

III. Symptoms

  1. Intermittent hand Thoracic Outlet Syndrome symptoms

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