Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal AP chest radiograph demonstrates mild tracheal narrowing at the thoracic inlet unchanged since CT 2 days prior . The lungs are fully expanded and clear . No retrocardiac opacity . The pleural surfaces are normal without large pleural effusion or pneumothorax . The costophrenic angles are not fully included on this study . Heart size , mediastinal contour and hila are otherwise unremarkable . Visualized osseous structures are notable for a surgical screw in the left scapula .
    OUTPUT:
    
1 . Narrowing of the trachea at the level of the thoracic inlet is unchanged since CT 2 days prior . 2 . No evidence of pneumothorax or pneumonia .