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I'm Dr Chaithanya, experienced attending you now
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there are 4 arteries which bring blood to your brain: left and right carotid arteries and left and right vertebral arteries.
the vertebral arteries travel up next to your spine and into the brain.
sometimes a blood vessel doesn't develop properly when we are formed as a baby.
you are still getting blood to your brain through 3 other arteries.
this finding could have been with you for as long as you have been alive and you really didn't know that you didn't have a right vertebral artery
this is not causing your right sided weakness
let me know if you have questions.