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Fig. 1B. —6-year-old girl with right aortic arch, mirror-image branching, and left-sided "absent" pulmonary artery. Oblique axial maximum-intensity-projection image derived from set of axial helical CT images (obtained during arterial phase) reveals absence of left main pulmonary artery and aortopulmonary collaterals (arrowhead) from descending aorta coursing through hilum to reach tiny intrapulmonary vessels (arrow).