CTICasesCircumflex Aortic Arch
Imaging findings
Chest radiography demonstrates a normal left-sided aortic arch with an oblique vascular line extending upward toward the right, along with mild right paratracheal mass effect and tracheal indentation. Contrast-enhanced CT confirms a circumflex aortic arch, characterized by a right-sided aortic arch that crosses posterior to the trachea and esophagus to descend on the left side, with an aberrant left subclavian artery.
Key takeaways
A circumflex aortic arch is a rare vascular anomaly where the aortic arch and descending aorta are on opposite sides (typically a right arch with a left descending aorta). The arch crosses behind the trachea and esophagus, which can result in a vascular ring and compress these mediastinal structures, occasionally presenting as dysphagia, dyspnea, or "asthma" symptoms.
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