Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable semi-upright radiograph of the chest demonstrates normal cardiomediastinal silhouette and pulmonary vasculature . The lungs are clear and mildly hyperinflated . There is no pleural effusion or pneumothorax . No definite free infradiaphragmatic air is noted .
    OUTPUT:
    
No free infradiaphragmatic air .