Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The cardiomediastinal silhouette , hilar contours and pleural surfaces are normal . There is no pleural effusion or pneumothorax . Moderate sagittal narrowing of the trachea is due to chronic lung disease and deviation rightward is due to the arch of the aorta .
    OUTPUT:
    
1 . No acute cardiopulmonary abnormality . 2 . Moderate tracheal narrowing due to chronic lung disease ; rightward likely secondary to impression by the arch of the aorta .