Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . The mediastinal and hilar contours are within normal limits . There is minimal atherosclerotic calcification at the aortic knob . The pulmonary vascularity is normal . Minimal streaky opacity in the left lung base is felt to reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Minimal left basilar atelectasis .