When I was a sophomore in high school my doctor wouldn't clear me for sports cause he thought I might have the same thing. After a bunch of echocardiograms they decided that I just had an enlarged aortic root and since I was like 6' 135 at the time they said as I gained weight it would move more in to the "normal" range.
I'm sort of in the same boat. Got tested after freshman year of undergrad after a dermatologist thought I was peculiar, musculoskeletally speaking. The genetic tests came back negative, but the echo put me borderline for an enlarged aortic root.
I know it hurts Austin now, but I'm super glad he's still alive, to be honest. He's lucky to have been able to play healthfully for as long as he did. I actually started to get really suspicious when the story came out about his eye, knowing that detached retinas are a symptom of Marfan syndrome. In fact, it really bothers me that he wasn't tested before, because just looking at him, it seems like something that should have been done. I truly hope this is a case where he fell through the cracks and not some sort of deal where doctors were told to look past the signs (slight hunch, huge wingspan, long and skinny,
detached retina for cryin out loud) just because he was a good athlete. Other athletes with the syndrome have died to ruptured aortas while playing because they were never diagnosed.