Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Cardiomediastinal silhouette and hilar contours are unchanged with mild unfolding of the thoracic aorta . Calcifications are noted at the aortic knob . There is re- demonstration of hyperexpansion of the chest with severe emphysema . Bibasilar opacities have since resolved compared to the prior examination . Increased opacity at the left apex corresponds to scarring as seen on prior CT exam . Additional areas of chronic scarring are noted in the right lung base . Pleural surfaces are clear without effusion or pneumothorax . The bones appear generally demineralized .
    OUTPUT:
    
1 . No dense consolidations to suggest pneumonia . 2 . Thoracic hyperexpansion with severe emphysema .