Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left pleural effusion , increased from prior . There is resultant compressive atelectasis of the left lower lobe . The right lung is clear and there is no right pleural effusion . The left heart border is completely obscured by the pleural effusion . No pneumothorax . Mediastinal contour is normal . Previously noted NG tube is been removed . Bony structures are intact .
    OUTPUT:
    
Interval increase in left pleural effusion , now large , compared to ___ .