We have two vertebral arteries that feed the same areas. They usually only pick up a small portion of the load. Maybe yours were picking up more than usual.

I can imagine an ultrasound technician trying to do a carotid ultrasound and not finding a blood flow signal. It would be interesting to watch him try to figure things out. Can you imagine someone trying to take your pulse on that side? They might think you are dead.

Maybe you want to get a tattoo that says "No pulse this side."

Did you have a normal MRI or was it a MRI/MRA. MRI's do not show arteries as well as MRI/MRA's do. With an MRA, they first do an MRI, then repeat it leaving out the blood signal. When they subtract the second image from the first, what is left is the signal or image of the blood.

I have seen mine. Very interesting. I have a 'pouch' in one of the vertebral arteries just above where it exits the vertebra.