TOS: Thoracic Outlet Syndrome involves the nerves traveling through the shoulder at the level of the 1st rib. The phrenic nerve does not typically travel through the outlet and is usually on the anterior scalene muscle that forms the anterior border of the outlet. Occasionally an accessory phrenic nerve may be dominant and travel through the outlet but I have not seen any cases with breathing problems.
Answered 7/6/2017
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