Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette is unchanged . A small left pleural effusion and adjacent atelectasis is present previously . A linear opacity in the right mid lung likely represent scarring , unchanged . Lungs are clear . Previously noted basilar opacities are less conspicuous on the current exam . No pneumothorax .
    OUTPUT:
    
No substantial change compared to prior examination .