Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compare to ___ , there is very mild improvement in the tiny left apical pneumothorax . Bibasilar atelectasis is unchanged . The lung volumes are normal . Normal size of the cardiac silhouette . Normal hilar and mediastinal structures . no pulmonary edema . No pleural effusions . Displaced left lower rib fractures are again seen in stable position .
    OUTPUT:
    
Since ___ , mild improvement in tiny left apical pneumothorax . Unchanged mild bibasilar atelectasis . Stable displaced fractures of the left lower ribs .