Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrate clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits . A mildly dilated or tortuous descending aorta is noted . There is no pleural effusion or pneumothorax . No air under the right hemidiaphragm is identified . Multilevel degenerative changes throughout the thoracic spine are identified .
    OUTPUT:
    
No acute intrathoracic abnormality .