Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP view of the chest demonstrates moderate left pleural effusion , unchanged since prior . Left lung base consolidation is again noted . Right pleural effusion has improved . Right lung base opacities likely represent atelectasis . Hilar and mediastinal silhouettes are unchanged . Heart size is normal . There is no pulmonary edema . Tracheostomy tube is noted with its tip terminating 3 .9 cm above the carina .
    OUTPUT:
    
In comparison to ___ exam , moderate left pleural effusion is unchanged . Persistent left lung base consolidation may represent atelectasis or infection in appropriate clinical setting .