Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are unchanged with calcification of the aortic knob again demonstrated . The pulmonary vasculature is normal without pulmonary edema . Minimal atelectatic changes are noted in the left lung base . No focal consolidation , pleural effusion or pneumothorax is seen . Scarring within the lung apices is again noted .
    OUTPUT:
    
Minimal left basilar atelectasis .