CT imaging confirms coarctation of the thoracic aorta. The thoracic aorta is narrowed just distal to the left subclavian artery. The patent ductus arteriosus was poorly delineated on CT, however, the cardiac echo confirmed this expected finding. High osmolar intravenous iodinated contrast media often causes artefacts (beam hardening and streak) on the routine non-modified soft tissue windows as is the case here. Windowing or reviewing bony windows can improve CT assessment, especially in CT angiographic studies (well demonstrated by the bony windows above).