Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright radiograph of the chest demonstrates clear lungs and normal hilar cardiomediastinal contours . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . There is no free air under the diaphragm .
    OUTPUT:
    
Normal radiographs of the chest . No evidence of pneumoperitoneum .