Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right basilar pigtail catheter with substantial interval decrease in the right pleural effusion , which is now moderate in size . Retrocardiac airspace opacification is most likely due to stable atelectasis . Severe cardiomegaly despite the projection is unchanged . There is no pneumothorax . Regional bones are osteopenic .
    OUTPUT:
    
Decreased moderate right pleural effusion status post pigtail catheter drainage . No other significant interval change .