FINDINGS:
The patient is status post median sternotomy and aortic valve replacement. 
 Heart size is top normal, decreased in size compared to the previous study. 
 The aorta is tortuous.  Pulmonary vasculature is not engorged.  Lungs are
 hyperinflated.  Minimal patchy atelectasis is noted in the lung bases without
 focal consolidation.  Small bilateral pleural effusions are likely present. 
 No acute osseous abnormalities detected.

IMPRESSION:
Minimal bibasilar atelectasis and probable trace bilateral pleural effusions.