CTICasesCircumflex Right Aortic Arch
Imaging findings
Chest CT demonstrates a right-sided aortic arch that passes posterior to the esophagus and trachea (circumflex arch) to descend on the left side of the thoracic cavity. A calcified left ligamentum arteriosum is clearly seen arising from the proximal descending thoracic aorta, completing a vascular ring.
Key takeaways
A circumflex aortic arch refers to an arch that crosses the midline posterior to the trachea and esophagus to descend on the contralateral side. When combined with a contralateral ligamentum arteriosum, it forms a complete vascular ring that can potentially compress the trachea and esophagus, though it may remain asymptomatic into adulthood.
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