hi Richard,

i have partial long thoracic nerve palsy which causes winging scapula, my scapula winging changes, depending on how much i use the arm, how much i lie on the scapula and how much i chest breathe (paradoxical breathing).
i believe that the majority of TOS is caused by the unstable shoulder girdle that is a consequence of partial long thoracic nerve palsy. if you are interested some of my earlier posts describe the techniques that i have used to overcome the winging and subsequent TOS good luck
regards towelhorse