First reported Intra-cavitary right-to-left coronary artery collateral in the context of D-TGA

A 29-year-old female had witnessed cardiac arrest. The patient had a history of dextro-transposition of the great arteries (D-TGA) and arterial switch operation (ASO). Transesophageal echocardiogram showed an enlarged left ventricle (LV) with severe dysfunction (ejection fraction of 20 ​%). She was placed on veno-arterial extracorporeal membrane oxygenation (ECMO) with the venous catheter in the right atrium (RA) and a peripheral arterial catheter. Computed tomography coronary angiography (CTCA) was requested.