Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right IJ central venous catheter terminates in mid SVC , unchanged . The diffuse airspace opacities have significantly improved , particularly bilateral upper lungs . The bilateral mid to lower lung airspace opacities persist but less severe . No new consolidation . Bilateral lower lobe atelectasis is unchanged . Bilateral pleural effusion is unchanged , left more than right . No pneumothorax . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
Persistent bilateral mid to lower lung opacities . Improved bilateral upper lung opacities .