Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP , upright and lateral views of the chest were obtained . The lungs appear clear bilaterally without focal consolidation , effusion , or pneumothorax . The heart size is stable . Mediastinal contour is unremarkable . Tracheobronchial tree calcification is noted . Bony structures are intact .
    OUTPUT:
    
No acute intrathoracic process .