Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly reduced compared to the previous exam . The heart size is normal . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . The lungs are clear . There is no focal consolidation , pleural effusion or pneumothorax . There are mild degenerative changes in the thoracic spine . No free air is seen under the diaphragms . No definite evidence for pneumomediastinum .
    OUTPUT:
    
No acute cardiopulmonary abnormality including no definite evidence of pneumomediastinum .