My little sister was a toe walker...this thread really brought back some memories. I was unaware that some of these conditions even existed, so please let me assure you that I am in no way making light of any medical condition...
BUT MAN WE TEASED HER LIKE CRAZY!!! Of course she outgrew it eventually, and now when me DD4 gets excited and prances on her toes we call her "Stacy Jr."
I am certainly no doc, and some have suggested getting a second opinion. My experience is just with my widdle sister, who outgrew her "toe walking" and is now a 26 year young woman with three college degrees...who only walks on her toes now after she's had one too many marguaritas.
Don't let all this information scare you OP. If your munchkin is like my sister, then this too shall pass.
Mel