Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is somewhat difficult due to differences in technique . There is interval increase in bilateral pleural effusions . The left pleural effusion is moderate to large in size . The left heart border is largely obliterated . There is evidence of underlying atelectasis or consolidation . This is probably greater on the left but obscured by pleural fluid . Mediastinal structures appear stable . The bony thorax is grossly intact .
    OUTPUT:
    
Interval increase in pleural fluid and underlying atelectasis and / or consolidation .