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"Unlike brain aneurysms, there are no well established risk factors for AVM formation, growth and rupture. They are regarded as "developmental" or "congenital" vascular anomalies, i.e. you're born with them and they typically increase in size as the brain enlarges. There are rare instances of persons with multiple AVMs (Wyburn-Mason syndrome, which involves multiple central nervous system AVMs, including in the eye's retina) said to be nonhereditary, but probably due to some yet-unknown genetic event)."
I hope this helps.