Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is of normal size . Prominence of main pulmonary artery contour is compatible with pulmonary arterial hypertension . The aortic contour follows the thoracolumbar scoliosis . Pulmonary vasculature is unremarkable . The lungs are clear without focal or diffuse abnormality . No pleural effusion or pneumothorax . No radiopaque foreign body .
    OUTPUT:
    
Prominent contour of the main pulmonary artery , compatible with pulmonary arterial hypertension .