Left bronchial compression and pulmonary hypertension related to anomalous right pulmonary artery

Anomalous origin of a pulmonary artery from the ascending aorta is a congenital defect that can be complicated by pulmonary arterial hypertension, typically due to vascular disease if the anomaly is left uncorrected past 6 months of age. We describe a unique case of severe pulmonary arterial hypertension with this defect in a 1-month-old infant unexpectedly caused instead by bronchial compression from her dilated left pulmonary artery.