label: Left aortic arch with isolated subclavian artery
label_lc: left aortic arch with isolated subclavian artery
description: "The subclavian artery arises from ductus arteriosus. While the ductus arteriosus is patent its blood supply comes from the ductus, hence from the pulmonary artery. After it closes, the blood supply is retrogradely from the vertebral artery via the circle of Willis."