Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , moderate left pleural effusion is mildly improved . Small right pleural effusion is again seen . Again seen are periapical bilateral scarring , severe upper lobe predominant emphysema and mild retrocardiac atelectasis . Heart size is top normal , unchanged . Compression deformity of mid thoracic spine is unchanged .
    OUTPUT:
    
Mildly improved moderate left pleural effusion and small right pleural effusion .