Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . The lungs are mildly hyperinflated . In association with saber sheath configuration of the trachea , these findings are suggestive of COPD in the appropriate clinical setting . Focal subsegmental atelectasis seen the base of the right lung on the frontal view .
    OUTPUT:
    
Mild right basal atelectasis with otherwise clear lungs .