Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . A band - like opacity in the left base likely represents segmental atelectasis . No other focal opacities are identified . There is no pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Band - like opacity in the left lower lobe may represent atelectasis although infection can not be excluded in the right clinical setting .