Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Streaky opacity in the left lung base may reflect atelectasis but infection is not excluded . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities seen .
    OUTPUT:
    
Streaky left basilar opacity could reflect atelectasis but infection can not be completely excluded .