Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overlying trauma board slightly limits assessment . Lung volumes are reduced . Heart size is normal . Mediastinal and hilar contours are unremarkable . Lungs are clear . No pleural effusion or pneumothorax is identified on this supine study . No displaced fractures are visualized .
    OUTPUT:
    
No acute cardiopulmonary process .