An aortopulmonary (AP) window involves a communication between the ascending aorta and main pulmonary artery. What distinguishes this from truncus arteriosus is the presence of 2 separate semilunar valves.
Superior Rim
Inferior Rim
Other Feature
Type
Term for Defect
definite
little
window just above sinus of Valsalva
I
proximal (Mori et al)
little
definite
II
distal (Mori et al)
little
little
III
total (Mori et al)
intermediate
intermediate
intermediate (Ho et al)
interrupted aortic arch
interrupted aortic arch
Differential diagnosis:
(1) pulmonary artery arising from the ascending aorta (hemitruncus)
(2) truncus arteriosus (does not have 2 separate semilunar valves)
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