Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate top normal heart size , which is stable . There is mild unfolding of the thoracic aorta . Mediastinal and hilar contours are unremarkable . The lungs are clear . There may be trace subsegmental volume loss in the left base . No pleural effusions , vascular congestion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary process .