Are you an athlete? Or lack there of? What is your profession? Usually winged scapulas are due to compensation by the body for something we are doing to it and yes can then cause TOS. I would say, almost always winged scapulas cause TOS. Are you in the States? If so, please look for a Postural Restoration PT. They are the bomb and really doing cutting edge stuff. You should start anterior serratus strength exercises, too.