Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . There is a vague opacity which is obscuring the right heart margin , unchanged from a recent radiograph . There is also a vague opacity obscuring the lateral margin of the left hemidiaphragm . Otherwise , cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Bilateral apical pleural parenchymal scarring is noted , more prominent in the left upper lobe . Bilateral severe degenerative changes of the shoulder joints are noted .
    OUTPUT:
    
Bibasilar patchy airspace opacities could reflect atelectasis , aspiration , or pneumonia .