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 . There is a suspected small right - sided pleural effusion with associated opacity , probably attributable to minor atelectasis . Otherwise , the lungs appear clear . There is no pleural effusion on the left . No pneumothorax is seen . Bony structures are unremarkable .
    OUTPUT:
    
Right basilar opacification , probably due to a small pleural effusion .