Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright frontal and lateral chest radiograph demonstrates opacification of the left lung base concerning for atelectasis or aspiration . Within the right upper lobe , there is a subtle opacity which is concerning for pneumonia . There are mildly increased bronchovascular markings within the upper lobes bilaterally . The cardiomediastinal and hilar contours are unchanged since ___ examination with a heart size which is top normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Bilateral scattered opacities in the lungs , most notable in the left lung base and right upper lobe concerning for pneumonia .