Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size is top normal . The mediastinal and hilar contours are unchanged , with mild tortuosity of the thoracic aorta redemonstrated . There is mild crowding of the bronchovascular structures , but no pulmonary edema , focal consolidation or pleural effusion is present . There are mild degenerative changes of the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .