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Fig. 6. —18-month-old girl with large perimembranous ventricular septal defect, right aortic arch with retroesophageal left subclavian artery (persistence of caudal part of left dorsal aorta and involution of left IV aortic arch) without diverticulum of Kommerell, right ductus arteriosus from underside of arch, and right-sided "absent" pulmonary artery (same patient as in Fig. 2A,2B,2C). 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.