Isolated Left Subclavian Artery From the Pulmonary Artery Masked by Pulmonary Hypertension.

Isolated subclavian artery arising from the pulmonary artery is exceedingly rare. Most cases are associated with other forms of congenital heart disease and typically present with subclavian or pulmonary steal syndromes. We report the case of a patient with pulmonary hypertension which masked the isolated subclavian artery, allowing it to masquerade as another common congenital heart lesion.