Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Tortuous descending thoracic aorta is accentuated secondary to more oblique positioning on the PA view . On the lateral radiograph , diameter of the aortic arch and descending thoracic aorta is stable to prior , measuring 4 .0 cm in maximum diameter in the proximal thoracic aorta . Aorta has not changed diameter in its descending portion . Minimal left basilar atelectasis . No infiltrates . No edema . Degenerative changes spine . The gastric and colonic distention .
    OUTPUT:
    
Stable diameter of descending thoracic aorta compared to ___ , appearance on the radiograph was secondary to oblique patient positioning .