Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle left base opacity may be due to atelectasis although infection or aspiration or not excluded in the appropriate clinical setting . No pleural effusion or pneumothorax is seen . Cardiac and mediastinal silhouettes are stable .
    OUTPUT:
    
Subtle left base opacity may be due to atelectasis however consolidation due to infection or aspiration not excluded in the appropriate clinical setting .