Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The degree of airspace opacity has increased when compared to the prior study , particular at the left lung base although there is likely also involvement of the right lower lung . No pneumothorax . No pleural effusion . The cardiomediastinal contour is normal . The visualized bony structures demonstrate moderate multilevel degenerative change .
    OUTPUT:
    
Increased bibasal airspace opacity , particular in the left lower lobe . Appearances are suspicious for infection or aspiration .