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Figure 5: Pulmonary angiogram (a) showing pulmonary trunk (MPA) continuing as a dilated RPA which is dilated in the medial zones and pruned in the lateral zones of right lung. The isolated LPA filled from a left-sided arterial duct (b) arising from the base of LIA. Aortogram (c) showing right aortic arch, a large right-sided tubular arterial duct (RPDA) connecting to the RPA. A complete balloon occlusion of the RPDA (d) is confirmed on an aortogram before assessing the pressures. LPA: Left pulmonary artery, RPA: Right pulmonary artery, LIA: Left innominate artery

Figure 5: Pulmonary angiogram (a) showing pulmonary trunk (MPA) continuing as a dilated RPA which is dilated in the medial zones and pruned in the lateral zones of right lung. The isolated LPA filled from a left-sided arterial duct (b) arising from the base of LIA. Aortogram (c) showing right aortic arch, a large right-sided tubular arterial duct (RPDA)  connecting to the RPA. A complete balloon occlusion of the RPDA (d) is confirmed on an aortogram before assessing the pressures. LPA: Left pulmonary artery, RPA: Right pulmonary artery, LIA: Left innominate artery