Hi,
I think your focus is all wrong.

Do you HAVE to present an interesting case (in paediatric or neuro... isn't everyone interesting?)? Do you HAVE to present/ research an aspect that you know nothing about?

Why do you not look into something that you are good at?
Why not research something that you enjoy doing?
Why not research e.g. outcome measures that you are using and reflect on whether they are worthwhile doing?

Just some thoughts.

Regards,
Fyzzio