Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to ___ , left pleural effusion has increased , causing significant atelectasis . Small right pleural effusion is unchanged . Left upper lung opacities may suggest pneumonia in the right clinical setting . Right basal scarring is again seen . The heart size is difficult to determine , though likely unchanged . The mediastinum and hilar contours are normal . Sternotomy wires are aligned and intact . Surgical clips are again seen .
    OUTPUT:
    
1 . Increased left pleural effusion and atelectasis . 2 . Possible left upper lung pneumothorax .