Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since 2 p .m . there is no change in left lower lobe atelectasis and low lung volumes . The Swan - Ganz catheter , endotracheal tube , enteric catheter , chest and mediastinal drains are in unchanged positions . There is no pneumothorax or new consolidation .
    OUTPUT:
    
No change in postoperative appearance of the chest .