Surgery All of the following is true about thoracic outlet syndrome except – A Adson's test is used for diagnosis B It may be caused by cervical rib C Pain, numbness and paraesthesia in the involved extremity occur D Upper trunks of the brachial plexus are commonly affected 💡 Explanation All of the following is true about thoracic outlet syndrome except - ✓ Correct Answer: D. Upper trunks of the brachial plexus are commonly affected