Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP upright chest radiograph demonstrates clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion , pneumothorax , or evidence of pulmonary edema . There is no displaced rib fracture identified . No air under the right hemidiaphragm .
    OUTPUT:
    
No acute intrathoracic abnormality .