Close
There is a persistent carotid-vertebrobasilar anastomosis arising from the left external carotid artery consistent with a type 2 proatlantal intersegmental artery.
The aberrant artery arises from the left external carotid artery at the level of C2, with the vessel then coursing dorsally and joining with the left horizontal vertebral artery in the suboccipital space, which then enters the foramen magnum (yellow arrows).
The left intracranial vertebral artery is also depicted (blue arrow).