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More model informationOne of the persistent carotid-vertebrobasilar anastomoses. Second most common after the trigeminal artery.
It arises from the distal cervical internal carotid artery, most often between C1 and C3 and passes through an enlarged hypoglossal canal before joining the basilar artery inferiorly. If large, the ipsilateral vertebral artery and PCOM are often hypoplastic or absent as in this case. There is an association with concurrent aneurysms.
Model derived from TOF MRA
https://radiopaedia.org/articles/persistent-carotid-vertebrobasilar-anastomoses-2
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