The UCLA vascular surgeon said every year or two. My CAA was discovered in 2014 and I had it checked again in 2016 and plan another CT scan in a couple of months. It was 1.4 cm in size both times. I wasn’t given any restrictions so it is life as usual. I do have some moderately severe GI issues about 6 months ago that lasted for a few mo this but much improved now. I was told that it was probably unrelated.