CTICasesCircumflex Aorta
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Imaging findings
Chest radiography shows leftward displacement of the trachea and a right paratracheal mass. CT reveals a right aortic arch with an aberrant left subclavian artery and a circumflex left-sided descending aorta, forming a complete vascular ring that constricts the esophagus and trachea.
Key takeaways
A right aortic arch with an aberrant left subclavian artery is a congenital vascular anomaly that can form a vascular ring when tethered to the left pulmonary artery by a ligamentum arteriosum. In the circumflex variant, the aorta crosses behind the esophagus to descend on the left, which can lead to compression of the esophagus and trachea.
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