Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is slight improvement in the left lower lobe retrocardiac opacity with residual opacity and cystic lucencies persisting . There is no new focal consolidation . No pleural effusion or pneumothorax is present . The cardiomediastinal silhouette is unchanged . There is no evidence of pulmonary vascular congestion .
    OUTPUT:
    
Slight improvement in retrocardiac opacity compared with ___ with no new focal consolidation .