Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac silhouette is enlarged . Bibasilar opacities have substantially improved since ___ with residual patchy and linear opacities remaining , right greater than left . Bilateral pleural effusions have also decreased in size with residual small effusions .
    OUTPUT:
    
Markedly improved bibasilar opacities compared to ___ with appearance favoring atelectasis . Coexisting aspiration or infection is not fully excluded . Short - term followup radiographs may be helpful if there remains clinical suspicion for pneumonia .