Very interesting.
Embryonic stem cells as therapy have done the same thing.
The problem is that embryonic stem cells can theoretically become ANYTHING. Teeth, skin, hair, malformed organs, etc.
That's why they are called "pluripotent".
Now I have no objection to using stem cells, once they've differentiated into what they will become. Like a kidney.
But it is sheer lunacy to even tamper with injecting embryonic stem cells anywhere in the body.
This case is a perfect example. It happens in nature with catastrophic results.
Imagine injecting some Parkinson's patient with a batch of cells that will become teeth in their brain.
Not good science at all.