Truncus arteriosus Type III truncus arteriosus 2012-04-08T03:08:53Z Type 3 truncus arteriosus Fyler:530 Persistent truncus arteriosus type III UMLS:C4021136 Fyler:0530 HP:0011609 Truncus arteriosus (single great artery leaving the base of the heart, giving rise to the coronary, pulmonary, and systemic arteries) whereby one of the two pulmonary artery branched does not arise from the common pulmonary trunk, but instead from the ductus arteriosus or directly from the aorta. According to the Van Praagh classification (PMID:2856609). The Van Praagh classification additionally specifies the presence (subtype A) or absence (subtype B) of a ventricular septal defect. persistent truncus arteriosus type iii persistent truncus arteriosus type iii; type iii truncus arteriosus