Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Streaky lingular opacity likely reflects atelectasis . The remainder of the lungs are clear . No pleural effusion or pneumothorax is seen . Blunting of the left costophrenic angle is chronic and may represent pleural thickening . There are no acute osseous abnormalities . Remote left - sided rib fracture is noted .
    OUTPUT:
    
Mild lingular atelectasis .