Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Basilar opacities with pleural effusions , left greater than right , persist and are mild . However , there is slight improved aeration of the right lung base as compared to most recent prior examination . Upper lungs remain clear . Mild vascular engorgement is chronic . There is no pneumothorax .
    OUTPUT:
    
Slightly improved aeration of the right lung base . No other significant change .