Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is improved aeration in the left upper lobe and in the right lung . Opacification of the left lower lobe with obscuration of the diaphragm is consistent with persistent left lower lobe atelectasis . The mediastinum is no longer shifted to the left consistent with improved volume loss in the upper lobe . There are no definite pleural effusions . There is a left central venous catheter which is kinked on introduction to the chest .
    OUTPUT:
    
Improved aeration at the left upper lobe and right lung . Slightly improved , but persistent atelectasis at the left lower lobe .