Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities are better appreciated on today 's examination and may reflect underlying atelectasis or developing infectious process . Mild pulmonary vascular congestion is unchanged without pulmonary edema . Heart size is top - normal . Left pleural effusion is small , if present . An enteric tube passes into the stomach and outside the field of view .
    OUTPUT:
    
Bibasilar opacities are concerning for pneumonia , alternatively atelectasis .