CTICasesType 1 Truncus Arteriosus with Right Aortic Arch
Imaging findings
In a cyanotic newborn, cardiac CT shows a single large vessel arising from the heart that gives rise to both the pulmonary artery and the aorta from a common trunk, consistent with type 1 truncus arteriosus. There is a right aortic arch with an aberrant left subclavian artery, and the common trunk appears to arise predominantly from the right ventricle across a ventricular septal defect.
Key takeaways
A single arterial trunk giving rise to both the pulmonary artery and aorta, with the pulmonary artery branching from the common trunk itself rather than from a normal right ventricular outflow tract, defines truncus arteriosus; subtyping (types 1-3) depends on the pattern of pulmonary artery branch origin from the trunk, and a right aortic arch with aberrant left subclavian artery is a recognized associated finding.
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