1. The truncus arteriosus splits into the ascending aorta and pulmonary artery. 2. As with truncus arteriosus, it was a rare occurrence. 3. The two asymptotes of a truncus are parallel to the coordinate axes. 4. Persistent truncus arteriosus involves a single valve; aortopulmonary window is a septal defect. 5. Fetal circulation does not include the lungs, which are bypassed via the truncus arteriosus. 6. Less common defects in the association are truncus arteriosus and transposition of the great arteries. 7. If the separation is incomplete, the result is a " persistent truncus arteriosis ". 8. A failure of the aorticopulmonary septum to divide the great vessels results in persistent truncus arteriosus. 9. "Aortopulmonary window " also refers to a congenital heart defect similar in some ways to persistent truncus arteriosus. 10. As a septum develops between the two ventricles of the heart, two bulges form on either side of the truncus arteriosus. 
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