FINDINGS:
Linear atelectasis is scarring in the lingula is improved when compared to the
 prior study.  Lung volumes are within normal limits.  The trachea is central. 
 The cardiomediastinal contour is unchanged.  The heart is not enlarged.  No
 pleural effusion seen on the AP projection however there is likely a small
 effusion on the left side seen on the lateral projection only.  No
 consolidation or pneumothorax seen.  The visualized bony structures are
 unremarkable in appearance.

IMPRESSION:
Probable small left pleural effusion.