CTICasesAneurysmal Aberrant Right Subclavian Artery
Imaging findings
Chest radiograph and chest CT show a massive, severely calcified, and atherosclerotic aberrant right subclavian artery (arteria lusoria) arising from the aortic arch and taking a retroesophageal course, presenting as a right paratracheal mass.
Key takeaways
An aberrant right subclavian artery is a common congenital aortic arch anomaly. Over time, the vessel can develop severe atherosclerosis and aneurysmal dilation (often associated with a Kommerell's diverticulum). These aneurysms carry a high risk of rupture and require surgical or endovascular repair when symptomatic or large.
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