Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are chronically low . The heart is mildly enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The lateral radiograph is degraded by motion artifact but an opacity projects over the lower spine .
    OUTPUT:
    
Mild stable cardiomegaly and chronically low lung volumes but not acute change .