Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes present . There is hazy opacity at the left lung base concerning for acute infectious process . No pleural effusions or pneumothoraces are seen . There is tortuosity of the thoracic aorta . Heart size is within normal limits . Overlying bowel gas pattern is nonspecific and osseous structures are grossly unchanged .
    OUTPUT:
    
Hazy opacity at the left lung base concerning for acute infectious process versus aspiration .