Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . Each hilum is mildly prominent , probably suggesting mild prominence of central pulmonary vessels , but there is no frank congestive heart failure . No focal opacification is seen aside from streaky left lower lung opacity suggesting minor atelectasis . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
Mild perihilar prominence , suspected to represent mildly prominent pulmonary vessels without definite pneumonia . Streaky left basilar opacification seen only on the frontal view is probably due to minor atelectasis or scarring .