Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Subsegmental atelectasis is noted in the lingula . Lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine . No subdiaphragmatic free air is identified .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No subdiaphragmatic free air .