FINDINGS:
The lungs are hyper expanded and clear. The cardiomediastinal silhouette is
 stable.  A prosthetic mitral valve is unchanged in position. Stable blunting
 of the bilateral costophrenic angles is possibly due to tiny pleural effusions
 or thickening.  There is no pneumothorax, pulmonary edema, or focal airspace
 opacification.

IMPRESSION:
Stable blunting of the bilateral costophrenic angles, possibly tiny pleural
 effusions or thickening.