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Seek and ye shall find… crossed pulmonary arteries. Comment on crossed pulmonary arteries with hypoplasia of the transverse aortic arch

I have read the recent publication on crossed pulmonary arteries with great interest, and I would like to both cordially thank the authors for bringing up the issue and share a comment on it. Reading the title, I had an impression that I had already seen such a configuration of the pulmonary arteries at least once before. By briefly re-assessing a set of 35 computed tomography angiographies (angio-CT) collected in the last 2 years, it was possible to identify two cases of crossed pulmonary arteries, both of the “lesser form”, and also dubbed malposition of the pulmonary branches without crossing. Moreover, both cases had evidence of the characteristic order of the arteries when observed cranial to caudal: duct or its “diverticulum”, left pulmonary branch, and lastly right pulmonary branch. The first case was a 30-month-old girl with a symptomatic vascular ring, a previously corrected ventricular septal defect, and a small atrial septal defect found to have a persistent left superior caval vein, right-sided aortic arch, and left-sided arterial ligament (Fig 1a–d). The ligament was ligated to