Right aortic arch: mirror-image branching
Asymptomatic patient with abnormal chest X ray on routine exam
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The aortic arch is right sided with mirror image variety of left arch. No aberrant subclavian artery or vascular ring to cause tracheal compression.
This anomaly is asymptomatic however may be associated with congenital heart diseases especially fallot tetralogy. There is no true vascular ring so there is no tracheal compression.