Fact-sheet: Persistent primitive trigeminal artery


Updated on 02/17/2022 at 11:09 AM

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Definition

Represents one of the variants of persistent carotid-vertebrobasilar anastomosis, with an estimated prevalence of 0.1-0.6%, generally unilateral

Classification

  • Saltzman type I: The persistent primitive trigeminal artery supplies the distal vertebrobasilar arteries. The posterior communicating artery is absent, and the caudal basilar artery is absent or hypoplastic, with hypoplastic distal vertebral arteries.
  • Saltzman type II: The persistent primitive trigeminal artery supplies the superior cerebellar arteries, with the posterior cerebral arteries supplied by the posterior communicating artery.