'Thoracic outlet syndrome' ('TOS') is a syndrome involving compression at the superior thoracic outlet Common orthopaedic tests used are the Adson's sign, the Costoclavicular_maneuver, and the "Hands-Up" test or "EAST" test. Careful examination and radiograph are required to differential diagnosis between the positional and static aetiologies, first rib fixations, Scalene muscles spasm, and a cervical rib or fibrous band.