Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unremarkable and within normal limits . Mild atherosclerotic calcifications are seen at the aortic knob . Pulmonary vasculature is normal . Lungs are hyperinflated with minimal subsegmental atelectasis in the lingula . Remainder of the lungs are clear . No pleural effusion or pneumothorax is seen . Degenerative changes are noted in the lower thoracic spine .
    OUTPUT:
    
Hyperinflation of the lungs suggests underlying COPD . Subsegmental atelectasis in the lingula .