Figure 1. (A) Echocardiography revealing several small tortuous blood flow signals between the aorta and the pulmonary artery. (B) Doppler ultrasonography revealing continuous left-to-right shunt signals at the arterial level with a step-like change. (C) Enhanced CT revealing the left portal vein draining into the inferior vena cava. (D-F) Selective angiography revealing the thoracic aorta’s body and the upper abdominal aorta-pulmonary artery collateral vessels.