Collett and Edwards classified truncus arteriosus based on the anatomic origins of the pulmonary arteries.
Truncus arteriosus involves the aorta, pulmonary arteries and coronary arteries arising from one great artery (the truncus). There is a single truncal valve that overrides a high ventricular septal defect and outflow from both left and right ventricles.
Origin of the Pulmonary Arteries
single artery arises from the truncus, then divides into left and right pulmonary arteries
left and right pulmonary arteries arise from truncus with ostia close to each other
left and right pulmonary arteries arise separately from opposite sides of the truncus (away from each other)
most common (48-68%)
least common (<= 10%)
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