Hi and welcome to the Chiari forum.
Many times Drs will refer to a Chiari DX as an incidental finding as that Dr is not well informed or experienced with this condition,....
U will need more testing....one being a CINE MRI to check CSF flow....the length of ur herniation is not as important as if it is creating a blockage of flow...
Chiari symptoms cycle...so they can come and go, and change from time to time....
We can loose upper body strength as well as in our legs as there are related conditions as well to be concerned with.
Testing for these related and non related conditions should be done and ruled out.
Find a true Chiari specialist and educate urself so u will be able to know when u do find the right Dr for u....use the list of Drs in our Health Pages to help u start to research Drs...the list is not meant to be used as a referral nor is it an endorsement for the Drs on the list....it is just a starting place, and was compiled by the members of Drs they have been to, treated by and liked.
http://www.medhelp.org/health_pages/Neurological-Disorders/DOCTORS-LIST-FOR-CHIARI-SYRINGOMYELIA/show/1062?cid=186