Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two AP upright images through the chest were obtained . These demonstrate clear lungs bilaterally . Cardiomediastinal and hilar contours are within normal limits . There is no pleural effusion or pneumothorax . Osseous structures are without acute abnormality . There is no free air under the diaphragm .
    OUTPUT:
    
No free air under the diaphragm . Unremarkable chest radiograph .