Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrates hypoinflated lungs with crowding of vasculature and bilateral lower lobe atelectasis . No pleural effusion or pneumothorax . No pneumomediastinum . Subtle blunting of the left cardiophrenic angle is most consistent with scarring . Prosthetic valves are noted , most likely mitral and aortic . Intact median sternotomy wires . A mildly calcified , tortuous aorta is present . The heart is mildly enlarged . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process . No pneumomediastinum or pneumoperitoneum .