Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright AP and lateral views of the chest demonstrate the lungs are well expanded , with no evidence of pleural effusion , pneumothorax , or focal airspace opacification . The cardiomediastinal silhouette is stable , and the cardiac size is mildly enlarged but unchanged . There is no subdiaphragmatic free air .
    OUTPUT:
    
No acute cardiopulmonary process .