Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate interval worsening of left lung opacity . The entire left hemithorax is now again opacified . Opacification is likely due to a large left pleural fluid collection in the setting of lobectomy versus less likely left lung collapse . There is persistent significant elevation of the left hemidiaphragm . The right lung is clear . There is no right pleural effusion . Cardiac size can not be assessed due to obscuration by the left hemithorax opacification . The mediastinum is not shifted .
    OUTPUT:
    
Interval increase in the opacification of left hemithorax , likely consistent with large left pleural effusion . Right lung is clear .