Chest radiographs of patients with tetralogy of Fallot, pulmonary atresia, and MAPCAs with varying degrees of pulmonary blood flow

(A) Chest radiograph of an unrepaired patient with excessive pulmonary blood flow demonstrates perihilar and bilateral pulmonary edema.
(B) Chest radiograph of an unrepaired patient with significant cyanosis showing a paucity of pulmonary blood flow.