CT
There is discontinuity of the aortic arch distal to the take-off of the left subclavian artery. The descending aorta emanates from the main pulmonary artery via a patent ductus arteriosus. The innominate including the right subclavian and common carotid arteries, left common carotid and left subclavian arteries branch normally without evidence of stenosis or aberrant configuration. The included intercostal and internal thoracic vessels are prominent with multiple collaterals.
The main, left and right pulmonary arteries are dilated without thrombus formation. The pulmonary arteries are engorged relative to their accompanying bronchi, which likely relates to some degree of arterial hypertension.
The heart is enlarged, with multichambered dilatation. A small membranous ventricular septal defect can be identified, although the interatrial septum is intact.
CT scout view demonstrates an enlarged heart with engorged pulmonary arterial vasculature.
On sagittal reconstruction, there is clearer delineation of the interrupted arch.
Axial representative image shows dilated main, left and right pulmonary arteries without definite filling defects.
Coronal view shows dilated main, left and right pulmonary arteries without definite filling defects.