Figure 5. Angiography of the anomalous arteries and pulmonary artery. (a) The arterial phase of selective angiography of the anomalous arteries (arrow) shows that the lateral and posterior basal segment inferior lobes are supplied by the aberrant arteries bifurcating from the descending thoracic aorta. (b) The venous phase shows that the perfusion of the left lower lobe is partly drained from the pulmonary vein into the left atrium and partly from the azygos vein (arrows). (c) Pulmonary angiogram shows that the apical and anterior basal segment inferior lobes are supplied by the pulmonary artery (arrows). A⁶, apical inferior lobe artery, A⁸, anterior basal segmental artery.