Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chronic changes in the right upper lung and right perihilar region are again seen . Since the prior study , there has been increase in the bibasilar opacities from vertically on the left , worrisome for pneumonia . Difficult to exclude a small left pleural effusion . The cardiac silhouette remains mildly enlarged . The aorta is calcified .
    OUTPUT:
    
Bibasilar opacities , left greater than right , increased as compared to the prior study raises concern for pneumonia .