Right arch with aberrant left subclavian artery
Work-up of opacity seen on CXR for confusion.
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First vessel from the arch is the left commmon carotid artery. Bilateral calcified pleural plaques.
Thrombosed ligamentum arteriosum. Kommerell's diverticulum/dilatation of the origin of the left subclavian artery causes compression of the left brachiocephalic vein resulting in contrast entering the heart via alternative routes.