Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is enlargement of the proximal descending aorta / aortic knob , consistent with known aortic aneurysm , stable since radiograph performed earlier today . No pulmonary edema is seen . There is bibasilar and left mid lung atelectasis / scarring . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
Enlargement of the aortic knob / proximal descending aorta , consistent with known aortic aneurysm . Bibasilar atelectasis .