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. 2022 Jun 30;4(3):e210089. doi: 10.1148/ryct.210089

Figure 29:

Diagram shows two commonly used classification systems for truncus arteriosus. Top row represents the Collett and Edwards system. Type I truncus arteriosus is characterized by origin of the main pulmonary trunk from the truncus, which further divides into the right and left pulmonary arteries; type II is characterized by the separate origin of the right and left pulmonary arteries from the posterior aspect of the truncus; type III is characterized by the separate origin of the right and left pulmonary arteries from the lateral aspect of the truncus; and type IV represents pseudotruncus (pulmonary atresia with a ventricular septal defect). Bottom row represents the Van Praagh system. Types A1 and A2 are equivalent to the Collett and Edwards types I and II, respectively; type A3 is characterized by atresia of the left or right pulmonary artery, with collateral flow to the ipsilateral lung; and type A4 is characterized by the presence of an associated interrupted aortic arch. (Adapted, with permission, from references 131 and 132.)

Diagram shows two commonly used classification systems for truncus arteriosus. Top row represents the Collett and Edwards system. Type I truncus arteriosus is characterized by origin of the main pulmonary trunk from the truncus, which further divides into the right and left pulmonary arteries; type II is characterized by the separate origin of the right and left pulmonary arteries from the posterior aspect of the truncus; type III is characterized by the separate origin of the right and left pulmonary arteries from the lateral aspect of the truncus; and type IV represents pseudotruncus (pulmonary atresia with a ventricular septal defect). Bottom row represents the Van Praagh system. Types A1 and A2 are equivalent to the Collett and Edwards types I and II, respectively; type A3 is characterized by atresia of the left or right pulmonary artery, with collateral flow to the ipsilateral lung; and type A4 is characterized by the presence of an associated interrupted aortic arch. (Adapted, with permission, from references 131 and 132.)