Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . A right basilar opacity is unchanged , likely representing subsegmental atelectasis or chronic scarring . There is no focal consolidation .
    OUTPUT:
    
No significant change in the appearance of the chest . Right basilar opacity , likely represents atelectasis chronic scarring .