FINDINGS:
There is atelectasis at the lung bases.  No focal consolidation is identified.
 There is mild cardiomegaly with tortuosity of the descending thoracic aorta. 
 There is no pleural effusion or pneumothorax.  No definite rib fracture is
 identified.

IMPRESSION:
1.  Bibasilar linear atelectasis.
 
 2.  Mild cardiomegaly.
 
 3.  No definite rib fracture identified.  If indicated, dedicated rib films of
 the area of tenderness may be obtained.