Type I |
Both PA arising from a short pulmonary trunk |
Type A1 |
Same as type I of Collet and Edward system |
Type II |
Separate origin of the PA from the posterior aspect of the
truncus |
Type A2 |
Same as type II of Collet and Edward
system |
Type III |
Separate origin of the PA from the lateral aspect of the
truncus |
Type A3 |
Left or right PA atresia, with collateral
flow to the ipsilateral lung |
Type IV |
A pseudo truncus (now considered a form of PA atresia with
VSD) |
Type A4 |
Truncus with associated aortic arch
interruption, hypoplasia or coarctation |