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A member asked:

Mri brain find: presence of a persistent trigeminal artery and hypoplasia of the basilar artery? what is this i read its very rare & cause aneurysm?

A doctor has provided 1 answer

Dodged a bullet: Persistent Trigeminal art. is associated with aneurysm in 14%, likely on a congenital basis. If one does not exist, it is unlikely to develop. http://thejns.org/doi/abs/10.3171/jns.1971.35.5.0601 Association does not prove causality, but we don't understand the embryology well enough to know the causes of aneurysms.

Answered 12/13/2016

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