Are there extra precautions required for SBRT to a lesion that is proximal to an aortic aneurysm?

Instead of jumping to the SBRT issue, I would like to take the question as posed because I think there is a question of clinical appropriateness involved. If I were referred a patient with an aneurysm at high risk of rupture and who has a concurrent early stage lung cancer for which SBRT was being r...