Sorry you are going through this, but welcome to the club. I also have a bicuspid valve and a thoracic ascending aortic aneurysm. I've had yearly echos to monitor until May of this year when cardiologist recommended a CT angiogram and referred me to a cardiac surgeon for consultation. My last echo in Dec 2023 measured aorta at 3.6cm, then in May 2024, radiologist reported aorta at 4.0. But when surgeon reviewed the same CT scan, he measured a range between 4.1 and 4.3. His explanation was that a CT is most accurate for the aorta measurement because of the multiple x-sectional slices they they look at, where an echo is better at looking at the dynamic movement of the blood flow and valve functioning. Also some of the x-sections may be cut obliquely (angled), and not square, which can result in a higher number. It's all very confusing at times. IMO, bottom line, CT should be more accurate and it's best to have the same cardiologist or cardiac surgeon review comparison studies. I will have second CT scan in December to look at rate of growth. I don't think my surgeon plans to go back to an echo for monitoring the aneurysm, but only for the valve which so far is functioning ok. Good luck and keep us posted.