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Artery of Percheron Anatomical Variant

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Optic Neuritis in MS

Spinal Dural AV Fistula (sDAVF)

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Persistent Trigeminal Artery (PTA)

Persistent trigeminal artery (PTA) : Is The most common persistent carotid-verebrobasilar anastmosis with cavernous ICA to basilar artery (BA) anastmosis.

Saltzman type I: PTA supplies the distal vertebrobasilar arteries. Absent PCOM. The caudal BA is absent or hypoplastic with hypolplastic distal vertebral arteries.
Saltzman type II: PTA supplies the superior cerebellar arteries with the PCAs are supplied via the PCOM.