Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are somewhat low . The lungs are otherwise clear . No pleural effusion or pneumothorax . Heart size is normal . Apparent calcified mediastinal lymph nodes are unchanged compared to ___ years prior . Cardiomediastinal hilar silhouettes are otherwise unremarkable .
    OUTPUT:
    
No acute cardiopulmonary abnormality .