Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased opacification in the left lung base with obscuration of the left hemidiaphragm when compared to ___ . Again noted is hyperinflation and flattening of the diaphragms suggesting emphysema . The cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
Left lower lobe pneumonia , more apparent than on ___ .