Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-erect AP chest radiograph demonstrates low lung volumes and minimal bibasilar atelectasis . The lungs are otherwise clear . There is no pneumothorax . The heart size is normal . The cardiomediastinal silhouette is unremarkable . Anterior cervical fusion hardware is partially visualized .
    OUTPUT:
    
No acute cardiopulmonary process .