Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A small to moderate right hydropneumothorax remains after placement of right basilar pigtail catheter drained most of the previously large right pleural effusion . Opacification of the right mid lung is likely atelectasis or re-expansion edema . Inferior approach central venous catheter ends at the inferior cavoatrial junction . The left lung is grossly clear . Cardiomediastinal silhouette is normal . There are right axillary clips .
    OUTPUT:
    
Marked interval decrease in right - sided pleural effusion , with a small hydropneumothorax remaining .