Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is unfolded . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Apart from mild subsegmental atelectasis in the lung bases , remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .