Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval improvement of the right - sided pleural effusion . The pleural effusion on the left side remains stable . There is a new peribronchial opacification in the left lower lobe which could be secondary to atelectasis or pneumonia . The aeration in the right upper lung appears to have improved . No free subdiaphragmatic gas , pneumoperitoneum or pneumomediastinum . The heart size is normal . The hilar and mediastinal contours are unremarkable . There is no pneumothorax .
    OUTPUT:
    
1 . Interval improvement of the right - sided pleural effusion . Stable left - sided pleural effusion . 2 . New left lower lobe atelectasis or pneumonia .