Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Patchy and linear opacity in left lower lobe opacity may reflect atelectasis , but infection or aspiration can not be completely excluded . The right lung is clear . No pleural effusion or pneumothorax is demonstrated . There are no acute osseous abnormalities . Mild anterior wedging of a vertebral body at the thoracolumbar junction is unchanged .
    OUTPUT:
    
Linear and patchy opacity in the left lower lobe may reflect atelectasis but infection or aspiration can not be completely excluded .