Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal with mild tortuosity of the thoracic aorta . Hilar contours are unremarkable . Lung volumes are low causing bronchovascular crowding . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . There is no evidence of pneumoperitoneum .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No evidence of pneumoperitoneum .