Truncus arteriosus Type II truncus arteriosus Truncus arteriosus (single great artery leaving the base of the heart, giving rise to the coronary, pulmonary, and systemic arteries) with each pulmonary artery arising separate from each other on the posterior or lateral aspect of the truncus. 2012-04-08T03:03:51Z 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. Type 2 truncus arteriosus HP:0011608 UMLS:C4021137 Fyler:0520 Fyler:520 Persistent truncus arteriosus type II persistent truncus arteriosus type ii persistent truncus arteriosus type ii; type ii truncus arteriosus