Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is mildly enlarged but unchanged . The aortic knob is calcified . Mediastinal and hilar contours are stable . The pulmonary vascularity is not engorged . Minimal streaky opacity within the left lung base could reflect atelectasis . No pleural effusion or pneumothorax is seen . Clips are noted within the left neck .
    OUTPUT:
    
Persistent streaky left basilar opacity which could reflect atelectasis . Infection can not be excluded in the correct clinical setting .