Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . Areas of scarring in bilateral mid and lower lung are longstanding and stable since ___ . There are no new lung opacities concerning for pneumonia , aspiration or atelectasis . Heart is normal size and hilar contours are normal . Lobulated opacity just lateral to the junction of the aortic arch and descending thoracic aorta is from a known pseudoaneurysm of the aortic arch and is better evaluated and described on multiple prior chest CTs . However , based on the radiographic appearance alone , this is unchanged since at least ___ .
    OUTPUT:
    
1 . No pneumonia . 2 . A lobulated opacity lateral to the aortic arch shadow is from known aortic arch pseudoaneurysm which is better described and evaluated on multiple prior chest CTs and unchanged since at least ___ .