Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single lead left anterior chest wall pacer is unchanged . Heart size is normal with mild unfolding of the thoracic aorta . Hilar contours are unremarkable . Lung volumes are low . Lungs are otherwise clear . Pleural surfaces are clear without effusion or pneumothorax . No obvious fracture is identified , though review of subsequent CT examination demonstrates a nondisplaced right ninth rib fracture , which is not radiographically apparent .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Nondisplaced right ninth rib fracture seen on subsequent chest CT is not radiographically apparent .