Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable chest radiograph demonstrates clear lungs . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . There is no air under the right hemidiaphragm . No displaced rib fracture is seen .
    OUTPUT:
    
No acute intrathoracic abnormality .