Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouettes are within normal limits . The thoracic aorta is mildly tortuous . The bilateral hila are unremarkable . The lungs are clear . There is no evidence of pulmonary vascular congestion . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No acute cardiopulmonary process .