Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are extremely low , accentuating the cardiac silhouette and pulmonary vasculature . Heart size is top normal with prominent tortuosity of the thoracic aorta . Hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . Bony structures are grossly intact .
    OUTPUT:
    
No acute cardiopulmonary abnormality .