Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are poorly inflated . The left lower lung field is opacified as it was in the prior exam , with a distinct linear consolidation tracking across the left lower lobe , likely representing atelectasis with a concurrent small pleural effusion . Otherwise , the remaining lung fields are clear . Cardiac sillhouette appears slightly smaller suggesting improvement of the pericardial effusion . There is no evidence of pneumothorax .
    OUTPUT:
    
1 . Cardiac sillhouette slightly less enlarged . 2 . Left lung base atelectases with a concurrent small pleural effusion does not appear significantly changed compared with prior exam .