Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low but without focal airspace opacity to suggest pneumonia . The heart is not enlarged . Again there are calcified mediastinal lymph nodes . The aorta is calcified . There is no pleural effusion or pneumothorax . No displaced rib fracture is seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No displaced rib fracture , however , chest radiographs have limited sensitivity for rib fracture .