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I've been told I have "preternaturally long" fingers.
I had two sets of "baby teeth" before my permanent teeth came in.
I have a concavity on my lower left ribcage, just where the ribs attach to my sternum.
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If you haven't been examined for aortic abnormalities I would suggest you do so soon. Pretty much everything you describe is a potential symptom of
Marfan's Syndrome .
The real danger is that in some cases the aorta is weak near the heart and needs to be monitored or surgically corrected.