FINDINGS:
Frontal and lateral views of the chest were obtained.  There are
 relatively low lung volumes.  The patient is status post median sternotomy and
 cardiac valve replacement.  There are areas of left greater than right
 bilateral mid to lower lung atelectasis.  The patient is status post right
 thoracotomy with unchanged appearance of the surgical fracture of the
 posterolateral right sixth rib and blunting of the right costophrenic sulcus.

IMPRESSION:
Bibasilar atelectasis and post-procedural changes.  No overt
 pulmonary edema.