FINDINGS:
When compared to prior, the left lung base opacity is more
 conspicuous, particularly on the frontal exam, and it was new from .  Elsewhere, the lungs are clear.  There is a small right effusion with
 possible trace left effusion as well.  Cardiac silhouette is enlarged but
 stable.  Atherosclerotic calcification is again seen at the aortic arch.

IMPRESSION:
More conspicuous left mid lung to basilar opacity when compared
 to most recent exam, compatible with pneumonia in the proper clinical setting.
 Recommend repeat after treatment to document resolution.