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Fig. 5. —6-year-old girl with mirror-image right aortic arch with left ductus arteriosus from base of left innominate artery and left-sided "absent" pulmonary artery (same patient as pictured in Fig. 1A,1B,1C,1D). Diagram shows primitive (seventh fetal week) and final arch and pulmonary artery anatomy. Roman numerals denote six (I-VI) primitive aortic arches and seventh intersegmental artery (VII). Truncoaortic sac is depicted in dark gray, ventral aorta in pink, dorsal aorta in light gray, intrapulmonary pulmonary arteries in light blue, and primitive aortic arches: III in red, IV in yellow, and VI in dark blue.