Hey Kamatsu,
As another member, Beth states in another post Negative help from the neurologist
“…the length of the hernia makes no difference in the severity of Chiari symptoms. A plug is a plug…”
For some % of people, they are symptomatic between certain perimeters, but some can also be symptomatic outside of these so called perimeters. Personally, if you’re symptomatic, I’d be trying to seek a 2nd opinion from a professional knowledgeable in Chiari.
Merl from the Moderator Support Team