Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is perhaps slight decrease in a moderate - sized pneumothorax and also increase in opacification of the right costophrenic sulcus that may reflect pleural fluid accumulation , atelectasis or both . The left lung remains clear .
    OUTPUT:
    
Slight decrease in pneumothorax . Increasing right basilar opacification ; otherwise unchanged .