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 no pleural effusion or pneumothorax . Vague opacity involves the anterior right costophrenic angle , but this is suspected to be most likely due to minor scarring or atelectasis perhaps associated with a small epicardial fat pad . More generally the lungs appear clear .
    OUTPUT:
    
Opacity in the right costophrenic angle although more likely due to atelectasis than acute infection . Correlation with clinical presentation is suggested .