Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . As on prior , there is dense consolidation at the left lung base obscuring hemidiaphragm . This may be due to a combination of consolidation , atelectasis and effusion . Hiatal hernia suspected . The right lung remains clear . 2 separate right subclavian lines are identified with the larger catheter seen with tip terminating in the right atrium . The smaller catheter tip is not clearly delineated on the current exam . Degenerative changes in the spine without acute abnormality .
    OUTPUT:
    
Dense left basilar opacity similar to previous exam which may be due to a combination of effusion , atelectasis and consolidation .