Chronische Cerebro-Spinale Veneuze Insufficiëntie

it looked to me like you did have a distending vein. It looks like it is NOT the internal jugular vein but some smaller veins like the external jugular vein.

It also looked like you were doing the Valsalva maneuver (not a karate move). This increases chest pressure and it is not uncommon for many people who do not have MS to have distsension of the vein.

That being said, it can indeed be a sign of collateral veins. But it cal also be seen in heart failure, obstructive lung disease and many other conditions.

But why focus on this. I would look at it like this;

If you have MS, you have CCSVI until proven otherwise