Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright and lateral views through the chest demonstrate clear lungs bilaterally . The mediastinal and hilar contours are within normal limits . Again demonstrated is a mild tortuosity of the great vessels unchanged since ___ examination . There is no pleural effusion or pneumothorax . Visualized osseous structures are unremarkable .
    OUTPUT:
    
No acute intrathoracic process .