Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normal . Mild subsegmental left basilar atelectasis . Cardiomediastinal and hilar silhouettes are normal . Pleural surfaces are normal . Stable thoracic scoliosis and degenerative changes of the right shoulder . The left pacemaker is intact with leads terminating in right atrium and right ventricle .
    OUTPUT:
    
Left pacemaker intact with leads in appropriate positions . No pneumothorax .