Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: New nasogastric tube coils in the stomach . Endotracheal tube terminates 3 .8 cm from the carina . Left subclavian venous catheter remains in the mid right atrium . Improved aeration at the left lung base , with decreased ipsilateral mediastinal shift . There is mild residual atelectasis and persistent small effusion . Right lung is essentially clear . Unchanged mild interstitial edema . Heart size is normal
    OUTPUT:
    
Improved left lower lobe aeration , with small residual effusion .