Paediatric case of left subclavian artery steal syndrome with an abnormal connection between the left subclavian artery and pulmonary artery.

The isolated subclavian artery is a rare malformation of the aortic arch. Pathophysiologically, as the isolated subclavian artery is connected to the ipsilateral pulmonary artery through the ipsilateral ductus arteriosus and vertebral artery, blood is easily "stolen" from the subclavian artery. [Extracted from the article]