Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The inspiratory lung volumes are appropriate . There is interval development of a faint opacity in the right lung base on the AP view , corresponding to retrocardiac density over the lower thoracic spine on the lateral view , which may represent early pneumonia . No pleural effusion or pneumothorax is present . The pulmonary vasculature is not engorged and there is no overt pulmonary edema . The cardiac silhouette is increased in size from ___ . The mediastinal contours are within normal limits . Mild tortuosity of the thoracic aorta . The hilar contours are within normal limits and unchanged .
    OUTPUT:
    
1 . Right lower lobe opacity may represent early pneumonia . 2 . Increased size of cardiac silhouette , ___ raises the possibility of pericardial effusion .