Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Consolidation within the left lung base appears slightly increased on the frontal view as compared to recent prior examination from ___ . However , on the lateral view , the opacity appears severity . A small amount of pleural fluid is likely associated with this opacity . The probable slight increase in the opacity may be due to either progression of underlying tumor or possibly due to superimposed infection . The remainder of the lungs appear clear . There is evidence of emphysema . Mediastinal and hilar contours are within normal limits .
    OUTPUT:
    
Slight interval increase in known left lower lobe opacity , more obvious on the frontal projection as compared to the lateral view . Findings could reflect progression of known tumor or superimposed infection .