Pulmonary venous obstruction in patients with transposition of the great arteries

We report two cases of complete transposition of the great arteries with pu lmonary venous obstruction which was diagnosed by intraoperative transesoph ageal echocardiography, but was not detected by transthoracic echocardiogra phy and cardiac catheterization. The pulmonary venous obstruction was relie ved simultaneously with arterial switch operation. The intraoperative trans esophageal echocardiography has great contribution for thorough evaluation of the pulmonary venous return of the patients.