Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The mediastinal and hilar contours are within normal limits . Within the left lung base , a new streaky airspace opacity is demonstrated and is nonspecific , and could reflect an area of infection and / or atelectasis . No pleural effusion or pneumothorax is present . The right lung is clear . There is minimal scarring within the lung apices . There are no acute osseous abnormalities .
    OUTPUT:
    
Streaky opacity within the left lung base , new from the prior exam , which could reflect infection and / or atelectasis .