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The Persistent Primitive Trigeminal Artery (PPTA) is an example of persistent carotid-vertebrobasilar anastomoses, in which the basilar artery and its branches are primarily supplied by an anastomotic arterial branch originating from the cavernous segment of the Internal Carotid Artery (ICA). Such a structure constitutes the largest of fetal carotid-basilar anastomotic arteries and usually involutes after the development of the Posterior Communicating Artery (P-com).
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Mageste et al. (2024) studied this question.
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