CTICasesDouble Aortic Arch
Imaging findings
Chest radiograph shows widening of the upper mediastinum without a clear aortic knob on either side. Neck CT confirms a double aortic arch completely encircling the trachea and esophagus, with a larger right arch and smaller left arch descending in the midline.
Key takeaways
Double aortic arch is a congenital vascular anomaly where the ascending aorta splits into two arches that encircle the trachea and esophagus before joining to form the descending aorta. It can remain asymptomatic into adulthood and presents as a midline descending aorta on imaging.
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