Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the ___ CXR , the previously seen bilateral posterior effusions are slightly larger . Allowing for technical differences , the cardiomediastinal silhouette is probably unchanged . Doubt CHF . Subtle bibasilar opacities are similar to the prior film . No new focal infiltrate or consolidation is detected .
    OUTPUT:
    
1 . Small bilateral posterior effusions , slightly larger than ___ . 2 . Bibasilar opacities are unchanged compared with ___ , but new compared with ___ . In the appropriate clinical setting , the differential diagnosis could include bibasilar infiltrate , though stability over time is more suggestive of atelectasis .