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I can't remember anyone else with a missing azygous. Missing jugulars, yes, but not the azygous.livabird has two azygous veins
...
I wonder what the AZY equivalent of collaterals would be. Illiac/lumbar veins?
Two azygous veins? Perhaps a (an apparent) bifurcation?
FWIW; When i had my first procedure, I was told that there was no stenosis in the azygous, but that there "is a bend". I presume that they did not mean the arch. In the video of the azygous portion of my 1st procedure
(the polish patient), there appear to be a couple of jets not going into the SVC. Perhaps collateralization there?