Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is within normal limits . Left base linear opacity likely represents atelectasis . Possible trace bilateral pleural effusions with blunting of the posterior costophrenic angles . Old left lateral rib fractures as well as mid thoracic and mid lumbar compression deformities are unchanged .
    OUTPUT:
    
Linear left basilar opacity , likely atelectasis . Possible trace bilateral effusions .