Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded , without focal opacities . There might be mild bilateral hilar vascular engorgement but no focal opacities . Cardiomediastinal contour is unremarkable . There is no pleural effusion or pneumothorax . No subdiaphragmatic free air is identified .
    OUTPUT:
    
No evidence of acute cardiopulmonary process .