Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No discrete pneumothorax identified . There is blunting of both costophrenic angles as well as bibasilar atelectasis . Unchanged septal thickening , likely chronic in nature . The size of the cardiomediastinal silhouette is within normal limits .
    OUTPUT:
    
No pneumothorax identified . Bibasilar atelectasis .