Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . There are no pleural effusions or pneumothorax . The cardiomediastinal and hilar contours demonstrate mild tortuosity of thoracic aorta and a mild cardiomegaly . Pulmonary vascularity is within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .