persistent truncus arteriosis Fyler:0500 Fyler:500 MP:0002633 MPheno.ontology PTA common arterial trunk complete failure of the common arterial trunk opening out of both ventricles to divide into the aorta and pulmonary artery during development persistent truncus arteriosus single outflow tract truncus arteriosis abnormal heart and great artery attachment abnormal truncus arteriosus septation aorticopulmonary septal defect