Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normalsize . Thoracic aorta is tortuous . Prominence of the left pulmonary outflow tract with enlargement of main pulmonary artery branches suggests pulmonary arterial hypertension . Clear lungs are hyperinflated and show emphysematous changes . No pleural effusions and no pneumothorax .
    OUTPUT:
    
No parenchymal lung lesions identified .