Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to priors , there has been no significant interval change . Moderate to large right pleural effusion is again seen . Linear underlying parenchymal opacities may be due to atelectasis versus scarring although underlying consolidation or lesion is not excluded . Left lung remains clear . Cardiac silhouette is unchanged . Hypertrophic changes are noted in the spine .
    OUTPUT:
    
Persistent moderate to large right - sided pleural effusion with associated airspace opacity likely at least in part due to atelectasis .