Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographdemonstrates well expanded and clear lungs . No pleural effusion or pneumothorax . Slightly prominent bulge superior to the right heart border is nonspecific and can be seen in the setting of a proximal ascending aortic aneurysm . A tortuous aorta is noted . Heart size and hila are unremarkable . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
Possible proximal ascending aortic aneurysm .