FINDINGS:
Lung volumes are relatively low.  Mild increase in interstitial markings
 diffusely bilaterally suggests interstitial edema.  No definite focal
 consolidation is seen.  There is possible trace pleural effusion posteriorly. 
 No large pleural effusion is seen.  The cardiac silhouette remains mildly to
 moderately enlarged.  The patient is status post median sternotomy and cardiac
 valve replacement.

IMPRESSION:
Mild interstitial edema.  Possible trace pleural effusion. Mild to moderate
 cardiomegaly.