Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette is enlarged but unchanged since prior examination . There are small bilateral pleural effusions . Increased opacity at the right lung base could represent atelectasis , however underlying infection can not be excluded . There is no evidence of frank pulmonary congestion . There is no pneumothorax . Note is made of a hiatal hernia and mitral annular calcifications .
    OUTPUT:
    
Small bilateral pleural effusions . Right basilar opacity could reflect atelectasis , however underlying pneumonia can not be excluded .