CTICasesTruncus Arteriosus with Interrupted Aortic Arch
Imaging findings
CT in a newborn in respiratory distress demonstrates a single common arterial trunk arising from the right ventricle giving rise to both the pulmonary arteries and the ascending aorta (type 1 truncus arteriosus). The ascending aorta gives rise to the carotid arteries and terminates in an interrupted arch. The descending aorta supplies the subclavian arteries and receives flow exclusively via the patent ductus arteriosus.
Key takeaways
Truncus arteriosus is a rare conotruncal congenital heart defect in which a single arterial trunk arises from the heart and gives rise to the systemic, pulmonary, and coronary circulations. It is classified into types I-IV based on the origin of the pulmonary arteries. Its association with interrupted aortic arch, as in this case, produces ductal-dependent systemic perfusion and is a neonatal surgical emergency.
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