Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Unchanged aneurysmal dilatation of the aortic arch and descending thoracic aorta . The lungs are clear . Mild to moderate cardiomegaly is unchanged . No pneumothorax , pulmonary edema , pleural effusion , or pneumonia .
    OUTPUT:
    
No pneumonia or acute cardiopulmonary process .