We describe a 48-year-old man with type 2 persistent primitive proatlantal intersegmental artery found incidentally on imaging. It is one of the rare persistent carotid-vertebrobasilar anastomoses in which the anomalous vessel arises from the external carotid artery and enters the skull through the foramen magnum.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6442851PMC
http://dx.doi.org/10.1080/08998280.2018.1533312DOI Listing

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