Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . There is vague opacity in the lingula but probably due to minor atelectasis , airway inflammation or both . Suspicion for a significant aspiration event is low , although some degree of aspiration is difficult to exclude as an explanation for this appearance .
    OUTPUT:
    
Vague streaky opacity at the left lung base .