Echocardiographic and three-dimensional computed tomographic diagnosis of crossed pulmonary arteries: report of three cases.

Crossed pulmonary arteries are rare anomalies of the pulmonary trunk and its branches. In this anomaly, the ostium of the left pulmonary artery originates superiorly and to the right of the right pulmonary artery. This anomaly is usually associated with other congenital cardiac and extracardiac diseases. We report three neonates with congenital cardiac diseases who had this anomaly, which was detected first by echocardiography and then confirmed by cardiac three-dimensional computed tomography.