CTICasesAberrant Right Subclavian Artery with Distal Aortic Origin
Imaging findings
Chest CT and 3D volume-rendered reformats demonstrate an aberrant right subclavian artery arising abnormally distal on the descending thoracic aorta near the level of the carina. The vessel courses superiorly and to the right behind the esophagus with significant tortuosity and atherosclerosis.
Key takeaways
An aberrant right subclavian artery (arteria lusoria) typically arises from the distal aortic arch just distal to the left subclavian origin. Extremely low/distal aortic origins near the carina represent rare embryological variants likely related to abnormal regression of the embryonic aortic arch segments.
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