Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The moderate left pleural effusion is not appreciably changed following placement of a pigtail catheter . Left lower lobe collapse is unchanged . There is no pneumothorax . The right lung remains clear . The heart and mediastinum are magnified by the projection .
    OUTPUT:
    
No appreciable change in moderate left pleural effusion following pigtail catheter drainage . Persistent left lower lobe collapse .