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Fig. 2B —42-year-old woman with shortness of breath and left pulmonary artery aneurysm due to aplasia of right pulmonary artery. Contrast-enhanced CT scan shows enlargement of left lower lobe segmental arteries and marked reduction in size and number of right lower lobe pulmonary vessels. Also evident are marked right atrial and right ventricular enlargement and right ventricular hypertrophy with bowing of interventricular septum toward left ventricle, indicating right-heart strain from pulmonary arterial hypertension.