Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with a mildly tortuous aorta . Hilar contours are normal . Stable blunting of the costophrenic angles is unchanged in appearance since at least ___ , and given this chronicity , this is likely due to pleural thickening rather than what was previously called pleural effusion . Significant , confluent areas of pleural thickening are present bilaterally , not significantly changed since ___ . Lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Significant , confluent areas of bilateral pleural thickening . What was previously called pleural effusion is likely significant pleural thickening given the long chronicity and identical appearance .