Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest were obtained . The lungs are clear without focal consolidation , effusion , or pneumothorax . Widened AP diameter of the chest could be indicative of underlying COPD . Heart and mediastinal contour appears normal . Atherosclerotic calcification along the aortic knob noted . The AP view is somewhat limited due to lordotic positioning . Bony structures appear intact .
    OUTPUT:
    
Hyperinflated lungs without definite sign of pneumonia or CHF .