Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral opacities are seen in the lung bases , which can be concerning for aspiration or infection . Asymmetric edema is thought to be less likely but can not be excluded . Moderate bibasilar atelectasis is noted . The heart size is normal . No pneumothorax or pulmonary edema .
    OUTPUT:
    
Bilateral opacities in the lung bases are concerning for aspiration , infection , or , less likely , asymmetric edema .