Dear Deb:
I am sorry but I am not aware of a neurological disorder named Parson's Down syndrome. There is a Parsonage-Turner syndrome, Down Syndrome, but no Parson's Down syndrome in my memory bank.
Sorry,
CCF Neuro MD
Deb,
There is also Parkinson's....what were your friend's symptoms, perhaps we can then figure out the name. (that is if it isn't Parson's Down) I haven't heard of that either.