FINDINGS:
The tip of an endotracheal tube is 4.7 cm from the carina.  There
 is stable moderate enlargement of the cardiac silhouette.  The mediastinum is
 normal.  A small left pleural effusion is unchanged.  An adjacent persistent
 hazy opacification at the left base likely represents atelectasis.  The right
 lung is clear.  There is no pneumothorax.

IMPRESSION:
Persistent left basilar atelectasis and small left pleural effusion.