Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright chest radiograph demonstrates clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits . There is no pneumothorax , pleural effusion , or pulmonary edema . No nondisplaced rib fracture is identified . .
    OUTPUT:
    
No acute intrathoracic abnormality . No displaced rib fracture . If concern for rib fracture persists , consider dedicated rib films with radiopaque marker indicating the site of clinical concern .