Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The mediastinal and hilar contours are normal . The pulmonary vascularity is normal . Streaky left basilar opacity likely reflects atelectasis . There is no focal consolidation , pleural effusion or pneumothorax . No acute osseous abnormalities are identified .
    OUTPUT:
    
Mild left basilar atelectasis .