Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to prior chest radiograph from ___ , there is an opacification at the right lower lung base which does not appear to obscure the right cardiac border . There is prominence of the right perihilar region . The left lung is unchanged . No significant pleural effusion or pneumothorax is present . Cardiac silhouette is mildly enlarged and stable . Mediastinal contours are unchanged .
    OUTPUT:
    
Right lower lobe opacity , concerning for pneumonia .