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Am J Dis Child. 1963;106(3):347. doi:10.1001/archpedi.1963.02080050349017.
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To the Editor: A patient with "Right Pulmonary Artery Arising from the Ascending Aorta"1 is indeed a "rare bird" but the embryological picture seems to be a special variety of congenital unilateral absence of a main branch of the pulmonary artery (UAPA) in which the right lung receives its entire blood supply from a single large vessel arising from the ascending aorta.2-4 The exceptions to this statement are those cases where the pulmonary artery arises from the ascending aorta near the aortic valve ring.1,3

As is the case with UAPA,5 aortic origin of the pulmonary artery may be labeled isolated if no other cardiovascular defects are found. Earlier reviewers 6 included patients with associated malformations but later writers have reported only the isolated defect1,2 or the defect associated with a small patent ductus.1,4 The explanation for the frequent association of a patent ductus with


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