Yes it sounds to me as though your flow is blocked again. Posteriorly is exactly where chiarians have that problem. I’m no dr of course, just went through 2 surgeries myself.
My second was due to significant adhesions and scar tissue completely blocking the flow. And I wonder if that could be an issue for you also
Do you have a chiari specialist?
Hi and welcome to the Chiari forum.
As KerriC 1 mentioned it does indeed sound as though you have yet another CSF obstruction and could be scar tissue.
May I ask, were ALL related conditions ruled out prior to surgery? And what type of dura patch was used?
Next, as KerriC1 asked, do you have a Chiari specialist?
It's possible you have something other then just scar tissue causing the obstruction and only a Chiari specialist will know to look for them.