dear lola,

I suggest you start reading all the relevant posts on the paediatric and neurological forum.
Use Google scholar and look up, ataxia and children and you will find hundreds of articles.

Why have you been asked to write a case report?
Could it be it is a means of forcing you to think about why you are doing what you are doing with this patient?
Look up the articles, the internet is wonderful in this respect. The whole world is at your feet.

Esther