EDEN TEST FOR THORACIC OUTLET SYNDROME (TOS) - SUBCORACOID ENTRAPMENT This test puts stress on the subcoracoid space, which is why this test is also known as the Costoclavicular Syndrome or Military Brace test. If you want to learn more about the anatomy of nerve entrapement in the upper quarter and possible sites where peripheral nerve entrapment might occur, we can recommend you to read the article by Pratt et al. (2005) in the comments below! | Physiotutors