Isolated Major Aortopulmonary Collateral as the Sole Pulmonary Blood Supply to an Entire Lung Segment

Figure 2

Digital subtraction cineangiography. Contrast injected into the left pulmonary artery shows a small left pulmonary artery perfusing only the left upper lobe of the lung. No flow is seen in the left lower lobe. There is no left lower pulmonary artery.