Hi, I am in a very similar situation. I was recently diagnosed with Aortic Root Ectasia which depending on which cardiologist you talk to you could be consider an aortic aneurysm or the stage right before an aortic aneurysm. I am 6'2 about 230lbs, 42 years old with young boys and my sinus of valsalva is 4.2 CM. My Echo showed 4.2CM, CT showed 4.4 CM and finally had an MRA which is most accurate at 4.2CM. I was definitely a nervous wreck about it for a few weeks but then became educated. Yes, you should be worried but don't let it get the best of you. Become educated and then just cautious. Good thing is you know what you have and now you can deal with it.
There are several things which are consistent amongst that cardiologist when it comes to aneurysms:
(1) Reduce your blood pressure. Mine was 120/80 but have been prescribed losartan to reduce it even more.
(2) No heavy lifting. Weight lifting used to be a huge part of my workout, unfortunately you do need to restrict how much you lift. I had two cardiologist advise to restrict to no more than 50 lbs.
(3) I have also had both cardiologist suggest a low carb diet which is better for your heart and maintaining an appropriate weight. I stuck with the low carb diet for the past 6 months and lost almost 20 pounds and feel great.
Im a data guy, so this might help....
My current cardiologist suggest that your aortic root is relative to your height and weight or body service area. Here is a link to estimate yours..
https://www.valleyheartandvascular.com/Thoracic-Aneurysm-Program/Calculate-Your-Relative-Aortic-Size.aspx
You can then compare to this risk chart.
https://openi.nlm.nih.gov/detailedresult.php?img=PMC2605304_yjbm_81_4_175_g06&req=4
when you research normal size I have found several consistent data points suggesting normal range for Sinus of Valsalva, i.e. range from 3.4cm-4.0cm and 2.9cm to 4.5cm. In theory you seem to fall within normal range (similar to myself) however I decided to treat as an aneurysm which means change of diet, workout routine, 6 month MRA and blood pressure meds. I am not being paranoid about it, but cautious.
The above was my reply to a simliar post a few months back. Ironically, I just saw a surgeon who specializes in aortic repair. He validated what i mentioned above, and good chance as long as you keep your blood pressure below 120/80, dont smoke and keep a healthy lifestyle..it may never grow.
Hope that helps a little, good luck!
Happy to answer any questions you may have.
Dan