Developmental Abnormalies
Failure of the truncus arteriosus to close results in the condition known as Persistent Truncus Arteriosus, or simply "Truncus arteriosus," one of many cyanotic heart defects or congenital heart defects.
Other pathologies of the truncus arteriosus include transposition of the great vessels (arteries in this case), and tetralogy of Fallot.
Read more about this topic: Truncus Arteriosus (embryology)