FINDINGS:
Subtle left base opacity most likely represents atelectasis and/or vascular
 structures rather than consolidation.  The right lung is clear.  There is no
 pleural effusion or evidence of pneumothorax.  The cardiac and mediastinal
 silhouettes are unremarkable.

IMPRESSION:
Subtle left base opacity most likely represents atelectasis and/or vascular
 structures rather than focal consolidation.