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j hnandley
I don't know about the institution where you had the echos, but at Stanford
(one of the first if not the first to utilize 3d echos on patients) until about one year ago they were only used on some patients in a research setting, All their echo machines are now 3 d (3 dimensional ) echocardiograph machines.
3d machines show much more detail than the old 2d ones.
So saying something was not seen 7 years ago with an echo and now is may be like saying Kirk Douglas didn't have dimple in his chin until this Christmas because your old TV didn't provide good enough resolution for you to detect it and you just got a HDTV, which does.
Hope this helps
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