Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The cardiomediastinal and hilar contours are within normal limits . There is mild emphysema , better appreciated on the CT done on ___ at 22 :51 . Opacity at the right base may represent atelectasis or infection in the appropriate clinical setting . There is a small right pleural effusion . No pneumothorax .
    OUTPUT:
    
Mild cardiomegaly . Small right pleural effusion and opacities at the right base could represent atelectasis / infection . Severe emphysema , particularly at the bases better appreciated on recent chest CT of ___ .