FINDINGS:
Lung volumes are low.  Patient rotation slightly limits assessment.  The
 patient is status post median sternotomy and CABG.  Cardiac silhouette size
 remains mildly enlarged.  The aorta is unfolded.  There is mild
 bronchovascular crowding and possible mild pulmonary vascular congestion. 
 Streaky left basilar opacity likely reflects atelectasis.  No focal
 consolidation, pleural effusion or pneumothorax is seen.  No acute osseous
 abnormalities are present.

IMPRESSION:
Low lung volumes with left basilar streaky opacity likely reflecting
 atelectasis.  Mild pulmonary vascular congestion.