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Transaxial CT of the chest with intravenous contrast in a soft tissue window shows an absent left pulmonary artery. The main pulmonary artery measures 3.7 cm, compatible with pulmonary hypertension. The left lung is hypoplastic, and the mediastinum is shifted to the left. There is no evidence of chronic pulmonary embolism, obstructing malignancy, or surgical changes. There are large extrapleural collateral vessels in the left posterior hemithorax.
