Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is persistent increased opacity at the left lung base likely due to component of left lower lobe atelectasis . Superimposed left - sided effusion has decreased in size . The lungs are clear otherwise without consolidation or edema . The cardiomediastinal silhouette is stable . Median sternotomy wires and mediastinal clips are again noted . Vertebroplasty changes are noted as well surgical clips in the right upper quadrant .
    OUTPUT:
    
Interval decrease in size of previously seen left pleural effusion . No other significant change .