Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is mildly enlarged but unchanged . The mediastinal and hilar contours are stable . Pulmonary vasculature is normal . Subsegmental atelectasis is demonstrated within the left lung base . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Mild degenerative changes are noted in the thoracic spine . Clips are demonstrated within the upper abdomen compatible with prior cholecystectomy .
    OUTPUT:
    
No acute cardiopulmonary abnormality .