Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Dual - lumen central venous catheter is seen in unchanged position . Low lung volumes are noted . Since prior , there has been interval decrease in size of the left - sided pleural effusion . The lungs are otherwise clear . Mitral valvular replacement is identified . Mediastinal surgical clips are identified . No acute osseous abnormality is identified .
    OUTPUT:
    
Interval decrease in size of left - sided pleural effusion . Otherwise , no change .