FINDINGS:
The heart size, mediastinal, and hilar contours are normal.  There is a linear
 opacity identified at the right lung base medially.  The lungs are otherwise
 clear without pleural effusion, focal consolidation, or pneumothorax.No
 evidence of free subdiaphragmatic air.

IMPRESSION:
No evidence of free subdiaphragmatic air.  Right lung base opacity medially
 potentially atelectasis noting that infection cannot be excluded.