like the built up pressure from the veins not being able to drain correctly causes a reflux or backwash of blood back into the brain, and it drops off the heavy iron deposits, which are what show up as lesions. That is why the lesions tend to group around the ventricle and not too many other places in the brain.

Arteries deliver blood to the brain, the veins carry the used blood away. This is why there is so much debris in the veinous system.

I want so badly for this thing to be an answer. I am cautiously optimistic.