Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large left pleural effusion is stable in size . Parenchymal opacity at the base of the left lung likely reflects compressive atelectasis . There is minimal atelectasis at the base of the right lung . No pneumothorax . No right effusion . Biapical pleural thickening is re - demonstrated . The hilar contours are unchanged . The aorta is heavily calcified as before .
    OUTPUT:
    
No significant change from ___ . Large left pleural effusion is unchanged .