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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 collateral.
The main, left and right pulmonary arteries are dilated without thrombus formation. The pulmonary arteries are engorged relative to their accompanying bronchi, which likely relate to some degree of arterial hypertension.
The heart is enlarged, with multichamber dilatation. A small membranous ventricular septal defect can be identified, although the interatrial septum is intact.