Chest radiograph of supracardiac total anomalous pulmonary venous connection (TAPVC)

Posterior-anterior chest radiograph of a school-aged child with unrepaired supracardiac total anomalous pulmonary venous connection (TAPVC) demonstrating the findings that produce the classic snowman appearance. Note the marked dilation of the superior vena cava (SVC), innominate vein, and the silhouette produced by the vertical vein. Pulmonary vasculature is engorged, and the cardiac silhouette is mildly enlarged.