Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The large loculated right pleural effusion has slightly decreased following pigtail catheter drainage . Associated opacities in the right lung are unchanged . Left basilar subsegmental atelectasis is mild . There is no pneumothorax . The heart and mediastinum are magnified by the projection .
    OUTPUT:
    
Large loculated right pleural effusion decreased following pigtail catheter drainage . No pneumothorax .