Hello - and welcome, Alex ~
My large AN was taking up so much room in that tiny space that when the neurosurgeon 'opened' my skull, he said the CSF 'gushed out' from being under pressure! Fortunately, I had no complications from the surgery and recovered nicely, as I hope you will.
Thanks for the visual, love the description and I can only imagine how bad that CSF wanted more space
I thought my surgeon had an interesting way of describing the same thing. He said it was like a nerf ball that was squished into a small space and when the space opened up, it expanded.
By the way, how do you "quote" someone from a previous response - inside the little box? The only thing I could find to do was to copy/paste the text of the previous response and to change its color.