Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The large hiatal hernia seen on previous exam is not clearly delineated on the current exam . There is dense left basilar opacity silhouetting the hemidiaphragm , likely in part due to pleural effusion with underlying consolidation and / or atelectasis suspected . Small right pleural effusion is also noted . Superiorly , the lungs are clear . Cardiac silhouette is grossly unchanged . Prosthetic aortic valve is again noted .
    OUTPUT:
    
Small right effusion . Left basilar opacity likely due to combination of effusion atelectasis and possible consolidation .