I had the same issue years ago, 15 to be exact. The doctors in my town said they had no idea what to do and after searching I found Dr. Charles Brantigan in Denver and he said no problem and did a jugular turn down to make a new subclavian vein. Works perfect and has for the pst 15 yrs. Not sure where you live but if you can see him. He'll take a look and fix it if he can.

And no, before many say he's retired he is only semi-retired but still doing surgery at University of Colorado in Aurora. Starting up a TOS clinic there.