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Related to double aortic arch: vascular ring
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2) In patients with a double aortic arch, bilateral indentation of the oesophagus is observed on the anteroposterior view, with the right-sided indentation superior to the left, and posterior indentation is observed on the lateral view.
Both types of vascular ring--the double aortic arch and the right aortic arch with an aberrant left subclavian artery--can have the same appearance on chest x-ray and barium esophagography.
Bilateral persistent impression is usually present with a double aortic arch.