Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the most recent study , lung volumes have slightly increased although they remain low . Cardiomediastinal silhouette is stable . Right upper lobe opacity corresponds to known mass . Heterogeneous opacities at the right base are largely stable and likely represent a combination of atelectasis pleural effusion and pleural thickening . Superimposed consolidation be difficult to exclude . No pneumothorax .
    OUTPUT:
    
The lung volumes slightly increased . Increased opacification of the right base likely represents a combination of atelectasis , pleural effusion , and pleural thickening . Superimposed consolidation can not be excluded .