Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph demonstrate clear lungs . Overall appearance of the chest similar to prior study performed ___ . Cardiomediastinal and hilar contours are within normal limits . There is no pulmonary edema , pleural effusion , or pneumothorax . Lungs are slightly hyperinflated .
    OUTPUT:
    
No acute intrathoracic abnormality .