<prompt> Thoracic outlet syndrome is primarily diagnosed by:Clinical EvaluationCT scanMRIAngiography  <response>: TOS refers to compression of subclavian vessels and nerves of the brachial plexus in the region of the thoracic inlet. Divided into: Vascular forms Arterial and or Venous and Neurogenic forms Compression resulting from TOS is dynamic and best evaluated clinically by mechanical provocative maneuvers Symptoms most commonly develop secondary to neural compromise Middle-aged women are most commonly affected 