Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities are seen which likely represent combination of pleural effusions and atelectasis although consolidation due to infection or aspiration is not excluded . Superior vena cava stent is re - demonstrated . Cardiac silhouette is mildly enlarged . Mediastinal contours are stable and unremarkable . A square radiopaque structure projects over the right upper hemi thorax , also present on the prior study .
    OUTPUT:
    
Bibasilar opacities may be due to atelectasis and small pleural effusions although consolidations due to infection or aspiration not excluded .