Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent elevation of the right hemidiaphragm . There is subtle opacification of the lateral right middle lobe , which may represent early developing pneumonia . Linear retrocardiac opacification likely represents atelectasis . No pulmonary edema . The Heart size is normal . There is enlargement of the pulmonary arteries bilaterally suggesting pulmonary arterial hypertension . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
1 . Subtle opacity in the lateral right middle lobe , which may represent early / developing pneumonia . 2 . Enlargement of the pulmonary arteries bilaterally , suggesting pulmonary arterial hypertension .