Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral upright images of the chest were obtained . These demonstrate clear lungs bilaterally . Re-demonstration of right hemidiaphragm elevation . There is no pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are stable in appearance when compared to radiographs dated ___ . There is no intra-abdominal free air . A stent is identified in the right upper quadrant , presumably biliary .
    OUTPUT:
    
No acute intrathoracic abnormality .