Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are reduced compared to the prior study . The heart size is mildly enlarged but unchanged . Mediastinal and hilar contours are stable , with mild thoracic aortic tortuosity unseen . Calcification of the thoracic aorta is also redemonstrated . There is crowding of the bronchovascular structures , but no pulmonary edema is present . There is no focal consolidation , pleural effusion , or pneumothorax . There are mild degenerative changes of the thoracic spine .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary abnormality .