Left pulmonary artery sling (LPAS) in a 3-month-old girl with a cardiac murmur. Axial thin chest CTA shows an anomalous left pulmonary artery (LPA) arising from the posterior part of the proximal right pulmonary artery (RPA) and coursing between the left main bronchus (black arrow) and esophagus (thin white arrow) to the left pulmonary hilum.