Extra cranial veins are just like traffic routes If you block 1 road it's no big deal to get out of a city, but block 2 or more and the problem is compounded. The flow is slowed. Cars run out of gas. The more blocks the worse the problem. Even a temporary block such as head position is not a problem unless there are no other or few alternate routes.
Of course this is very simplified but it's true.
Cat (Catherine Somerville on FB)
My 35 yo daughter is newly dx 8/19/10 (had 12 symptoms)
Dx with Type A CCSVI- 1 IJV & double "candy wrapper" appearance of her Azygos
Venoplasty done Sept 21, 2010
Doing extremely well-