Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky left base opacity likely represents atelectasis . Otherwise , the lungs are clear . There is no pneumothorax or pleural effusion . The hilar and cardiomediastinal contours are normal . Pulmonary vascularity is normal . No free air is seen under the diaphragm .
    OUTPUT:
    
1 . Streaky left base opacity likely represents atelectasis . . 2 . No free air is seen under the diaphragm .