Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous and a small hiatal hernia is again noted . Mediastinal and hilar contours are otherwise unchanged . Pulmonary vasculature is normal . Linear opacity within the lingula is compatible with an area of subsegmental atelectasis . Remainder of the lungs are clear without focal consolidation . No pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .