Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is unchanged . There is no large pleural effusion . There is no pneumothorax . Bibasilar opacities likely represent atelectasis versus pneumonia . There is mild interstitial edema .
    OUTPUT:
    
Bibasilar opacities which may represent atelectasis or pneumonia .