Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates subtle increased opacity at the right lung base . Cardiomediastinal and hilar contours appear stable . Heart is within the upper limits of normal in size . There is no overt pulmonary edema . There is no pleural effusion or pneumothorax . A left chest dual lead pacer is identified , its leads in stable position . Osseous structures demonstrates no acute abnormality .
    OUTPUT:
    
Subtle opacity at the right lung base which may reflect very early infectious process . There is no overt pulmonary edema .