CTICasesAortic Arch Origin of the Right Vertebral Artery
Imaging findings
CT shows the right vertebral artery arising from the distal aortic arch and coursing up behind the esophagus toward the right side to reach its usual location, with a small Kommerell-like diverticulum (infundibulum) at its origin. The right subclavian artery arises from the brachiocephalic trunk.
Key takeaways
Distal aortic arch origin of a vertebral artery is a benign anatomic variant, and a small diverticulum at its origin (a Kommerell-like protrusion or infundibulum) should not be mistaken for a penetrating aortic ulcer or trauma; seeing the vessel arising from its apex confirms its benign nature. Both vertebral arteries can occasionally arise from a similar arch location.
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