Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The large left pleural effusion and compensatory atelectasis are not significantly changed from previous examination . The right lung , heart border , and hemidiaphragm are clear . Mediastinal contours are stable . A left single lead pacemaker is unchanged in appearance .
    OUTPUT:
    
Stable large left pleural effusion and atelectasis .