The Azygos vein drains the spinal area. The Azygos is not easily determined on the MRI/MRI scans. Mine was found with Venography during the procedure.
It was the last venous abnormality located and repaired.
there are veins that are designed (by our bodies) to serve/drain all areas.
I hope this helps. So, no the Jugulars are not draining all parts and there are other veins that do and those veins are known to the vascular experts and they will be looking for those problems.
I hope that was the question? thanks, Rose
ps. and I know I cannot spell Azygos.