Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Patient is known to have moderate layering pleural effusions which partially layer posteriorly accounting for lower lung projected opacities . There is likely compressive lower lung atelectasis . There is possible mild hilar congestion . The upper lungs appear well aerated . The cardiomediastinal silhouette is grossly unchanged . Bony structures are intact .
    OUTPUT:
    
No significant change in bilateral moderate layering pleural effusions with compressive lower lobe atelectasis . Mild hilar congestion difficult to exclude .