Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle bibasilar opacities could be resolving pneumonia , aspiration , or atelectasis . There is no pulmonary edema . There is no pleural effusion or pneumothorax . Aortic arch is dilated .
    OUTPUT:
    
1 . Bibasilar subtle opacities could be atelectasis , resolving pneumonia or aspiration . 2 . Probable aortic arch aneurysm .