Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and ascending aortic repair . Heart size is normal . The mediastinal and hilar contours are unchanged . Elevation of the left hemidiaphragm is chronic with subsegmental atelectasis re - demonstrated in the left lower lobe . Lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is present . Pulmonary vasculature is not engorged .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Atelectasis in the left lower lobe with elevation of the left hemidiaphragm , as seen previously .