Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent examination , there is a persistent moderate left pleural effusion , not significantly changed in size and elevation of the left hemidiaphragm , also unchanged . Large mediastinal or left paramediastinal opacity also appears similar in extent to the most recent examination and corresponds to the large thoracic aortic aneurysm seen on comparison CT . The right lung is clear .
    OUTPUT:
    
Overall stable examination since ___ .