Genetic test uncovers Florida girl's extremely rare disorder

Tessa Bruner is the only child in Florida suffering from CLN2, also known as Batten Disease. It's an extremely rare nervous system disorder.

Batten Disease can strip kids of their motor skills and cognitive processing. It's so rare there's only about 300 cases ever recorded in history.

The condition comes with a life expectancy of just eight to 10 years.

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