Dilation of aorta

I am hoping someone can shed some light on a recent echo report I had.

I was told I have dilation of the aortic root, sinotubular junction and ascending aorta.

The values are as follows:

Aortic Root:  3.4cm
Sinotubular junction:  2.76cm
Ascending Aorta:  2.64

It also says I have Trivial Mitral Regurgitation which from what I can tell is a normal finding.

I am a 33 year old female and was weighed at 121 lbs and measured at 5 feet 7.5
inches tall prior to the exam.

I can't find anywhere on the internet that provides normal values for the
sinotubular junction and ascending aorta.  From two past echo reports, I have
values for the aortic root but not the other two.  Both reports say an aortic
root is normal all the way up to 3.7 cm so I am not sure why I am now told 3.4
is abnormal.  I had an aortic root measured at 3.3 in 2005.  Another echo performed this last May had in measured at 2.6 but I will assume that was inaccurate.  I have never had measurements of the sinotubular junction or ascending aorta before.

I have suffered from dizzy spells and palpitations (PACs, PVCs, and Tachy episodes) for about 3 years now. I was told back in May that I likely suffered from Neurocardiogenic Syncope after an echo, nuclear stress test and Holter came back normal.   I was taking Lisinopril for HBP but just switched yesterday at my doctor's recommendation to Toprol XL 25 mg (generic form).

I am seeing a cardiologist next month who specializes in Marfan's/Ehlers Danlos
to see if I could possibly have one of the disorders.  Ruling out these disorders was the reason I had this echo recently.  I had it performed at Children's Hospital because they have a leading Marfan's/Ehlers clinic in my area.

Does anyone know the normal ranges for the above abnormalties?  I am not sure how dilated they truly are because they did not include a range on the report.  

I am concerned since my maternal grandfather died at my age of an aneursym.

[KLB32]

Ok, now I see two aortic root values.  The 3.4 measurement says it's in M-Mode.  The other says it's 2-D and the measurement is 3.54.  Which one is accurate?