Enlargment of the hypoglossal canal in the presence of a persistent hypoglossal artery.
Enlargement of the hypoglossal canal with preservation of its cortical margin is described as a normal variant when a persistent hypoglossal artery is present.
D001488:Basilar Artery / Q000002:abnormalities; D002343:Carotid Artery, Internal / Q000002:abnormalities; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000000981:diagnostic imaging*; D009777:Occipital Bone / Q000000981:diagnostic imaging*; D011859:Radiography