<prompt> Which is not true about thoracic outlet syndrome -Radial Nerve is commonly affectedNeurological features are most common.Resection of 1st rib relieves symptomPositive Adsons test  <response>: Not the Radial nerve, but Ulnar nerve is most commonly affected in thoracic outlet syndrome.Thoracic Outlet Syndromeis the collective name which includes -Cervical rib syndromeScalenus anterior syndromeCostoclavicular syndromeHyperabduction syndromePectoralis minor syndromeFirst thoracic rib syndromeThe syndrome is caused by compression of the brachial plexus or subclavian vessels in the region of thoracic inlet. The symptoms may arise from neural, vascular or combined compression.Neurological symptoms are more commonCompression of the brachial plexus usually affects its lower trunk C8 T1.Symptoms are - Pain, paraesthesia and numbness usually in the finger and hands in the ulnar nerve distribution.Symptoms of Arterial Compression are seen less frequently in about 14 of the cases.Symptoms are - Pain, numbness, paresthesia, coldness and weakness of the arm or hand. Raynauds phenomenon may also occur.Venous symptoms are less common and include edema, venous distention, pain and cyanosis.Diagnostic tests or manoeuvres :Adsons testCostoclavicular compressive testHyperabduction test. 