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Chest X-ray in a patient with idiopathic pulmonary arterial hypertension. (a) Posteroanterior projection showing dilated pulmonary arteries (stars), cardiomegaly (horizontal line), and rapid tapering (pruning) of right pulmonary artery (arrow). In addition, there is a decrease in the pulmonary vasculature in the periphery of the lung (arrow). (b) Lateral projection depicting a decrease in the retrosternal air space (arrow)
