Left Subclavian Artery Isolation with Right Aortic Arch and D-Transposition of the Great Arteries.

• In subclavian artery isolation, a subclavian artery arises from a pulmonary artery. • Subclavian artery isolation with d-TGA has unique findings on physical examination. • Subclavian artery isolation with d-TGA is often a missed diagnosis on echocardiogram. • Diagnosis is made more often using CCT, CMR, or invasive angiography. • Preoperative diagnosis enables surgical correction during arterial switch operation.