Does any one know the risks of aortic aneurysm surgery?

It depends: Depends on other comorbid risk factors like coronary artery disease, peripheral disease and lung disease.

Open or Stent?: Major surgery of any kind carries certain risks that vary from one person to another, depending upon the patient's general state of health. The surgical risk for repair of an abdominal aortic aneurysm increases with age and the presence of other health conditions. As examples, people who have other heart or lung diseases, and people who smoke are more likely to develop complications.

Varies: Risk also depends on whether the repair is open or endovascular.