Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single frontal AP radiograph of the chest was obtained . The lungs are clear without consolidation or edema . There is no pleural effusion or pneumothorax . The lung volumes are low . The cardiomediastinal silhouette is normal and unchanged from the prior radiograph .
    OUTPUT:
    
No acute cardiopulmonary process .