Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear aside from increased reticular opacities at the right lower lung , which has been stable since ___ . Patient has known emphysema . There is no evidence of pneumonia . Cardiomediastinal contours are normal and there is no pleural abnormality . Bony structures demonstrate multilevel degenerative changes in the thoracic spine as well as diffuse bony demineralization .
    OUTPUT:
    
No evidence of pneumonia . Emphysema