Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again demonstrated is a moderate - to - large right - sided hydropneumothorax that appears unchanged compared to the prior study . There is mild atelectasis of the right lung . The mediastinal structures are not significantly shifted towards the left , and the heart size is normal . The left lung is clear . No left - sided pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
No significant interval change in moderate - to - large right hydropneumothorax .