A 22-year-old man had cerebral venous sinus thrombosis and his angiogram incidentally revealed an absent left common carotid artery with bovine origin of the left external carotid artery. There was also an associated low bifurcation of the right common carotid artery and basilar artery fenestration. The absence of a common carotid artery is a very rare angiographic finding, and an association with a bovine origin of the left external carotid artery has not been reported previously in the literature. Here we provide a description of the case along with a review of the literature and embryology.
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Contributors SG performed the DSA and drafted the paper. Both authors were actively involved in patient care and management. Both authors were involved in critically analyzing the paper and approve the contents of the paper. Both authors also agree to be accountable for all the aspects of the work submitted for publication.
Competing interests None declared.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.