Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison with the study of ___ , the left hemidiaphragm can now be visualized , possibly because of the change in patient position . There is substantial opacification involving the left lower lobe , consistent with pneumonia . The right lung and upper portion of the left lung are clear . Central catheter remains in place .
    OUTPUT:
    
Left lower lobe pneumonia .