Persistent primitive trigeminal artery
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At the time the article was created Donna D'Souza had no recorded disclosures.View Donna D'Souza's current disclosures
At the time the article was last revised Craig Hacking had the following disclosures:
- Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)
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Persistent primitive trigeminal artery (PPTA) is the most common type of the four persistent carotid-vertebrobasilar anastomoses. It is present in 0.1-0.6% of cerebral angiograms and is usually unilateral.
In utero, the trigeminal artery supplies the basilar artery before the development of the posterior communicating and vertebral arteries. The PPTA arises from the junction between petrous and cavernous segments of the internal carotid artery, and runs posterolaterally along the trigeminal nerve (41%), or crosses over or through the dorsum sellae (59%). Vertebral, posterior communicating and caudal basilar arteries are often hypoplastic.
There are 3 types of PPTA 5:
Saltzman type I: PPTA supplies the distal vertebrobasilar arteries. The posterior communicating artery is absent and the caudal basilar is absent or hypoplastic with hypoplastic distal vertebral arteries.
Saltzman type III: PPTA does not join the basilar artery, instead directly terminating as the
type IIIa: superior cerebellar artery
type IIIb: anterior inferior cerebellar artery
type IIIc: posterior inferior cerebellar artery