CTICasesCircumflex Aorta
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Imaging findings
Low-dose chest CT in an infant reveals a rare vascular ring anomaly featuring a right-sided aortic arch that courses retroesophageally to cross the midline, with the descending aorta running on the left. A patent ductus arteriosus (PDA) completes the vascular ring, causing extrinsic compression and dilatation of the proximal esophagus.
Key takeaways
A circumflex aorta is a rare vascular ring anomaly where a right-sided arch with a retroesophageal component crosses to descend on the contralateral (left) side. The ring is typically completed by a PDA or ligamentum arteriosum, which can compress the trachea and esophagus, leading to respiratory stridor or dysphagia.
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