Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . There is minimal streaky opacity in the left lung base . No focal consolidation , pleural effusion or pneumothorax is identified . No acute osseous abnormalities detected .
    OUTPUT:
    
Minimal streaky left lower lobe opacity , likely atelectasis . Early infection can not be completely excluded in the correct clinical setting .