As far as I understand (I'm not a Dr but it was explained to me by my Drs) Open Heart Surgery is the only way to repair an ascending aortic aneurysm. The proper way to repair it is by replacing the affected area of the aorta with an artificial graft, there is no other way to do that but having direct access to that area of the aorta, unfotunately that is only possible with the chest open. In my case my cardiologist explained that there is a small chance I may develop another dialation where the graft and the aorta were sawn together (it may take many years if it happens at all) in that case TVAR is an option, but not fo the repair of a critically enlarged aorta. Mine was done 5 years ago, it was found while preping me for leg suregry from a bike accident at 5.2 which was large for my body size, I had surgery 3 months after my leg surgery.

I hope that helps, find the best thoracic surgeon available to you and a cardiologist who specializes in aortic diseases, they would be able to explain the process and your options.

Hope everything goes well!!