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Fig. 2A —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 aneurysm of main pulmonary artery and enlargement of left pulmonary artery. Evident are prominent bronchial artery (curved arrow), right internal mammary artery collateral vessels (straight arrow), and aplasia of right pulmonary artery.