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 requested, I would ensure that the aneurysm is the condition that is addressed first since this poses the greatest risk to the patient and not the cancer. If I were referred a patient who, for whatever reason, is not having the high risk aneurysm addressed and still being referred for consideration of SBRT, I would have to have a discussion on the perceived benefits of treating an early stage cancer in the presence of an untreated aneurysm that wo...