Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall , no significant interval change . Persistent small left pleural effusion with adjacent compressive atelectasis . Retrocardiac opacity likely reflects a combination of atelectasis and a known hiatal hernia . The cardiomediastinal silhouette is unchanged . The lungs are otherwise clear without new focal consolidation , edema , or pneumothorax . No right pleural effusion .
    OUTPUT:
    
No significant interval change . Persistent small left pleural effusion .