Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is a left basilar opacity , unchanged since the previous exam and likely representing combination of pleural effusion and / or atelectasis . No pneumothorax is identified . There is minimal right basilar atelectasis . There may be small right pleural effusion . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Overall , no significant change in left basilar opacity .