Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube tip is 6 cm above carina at the level of the clavicles . Consider advancing the ET tube by 1 - 2 cm for better seating . Tip of right subclavian line ends at mid SVC . Opacification of the left lung base , unchanged since yesterday , can simply be explained by a combination of mild - to - moderate effusion and accompanying left lower lung atelectasis . Left upper lung and right lung are clear . Heart size is normal . Mediastinal and hilar contours are unremarkable . No pneumothorax .
    OUTPUT:
    
Mild but increased opacification at the left lung base , unchanged over last 24 hours , is likely atelectasis and / or consolidation . Pleural effusion if any is small on the left side . No pneumothorax .