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Hi wildtiger,

Thank you for your question and welcome to Empowher. I hope this link will help answer your question as there is information about treatments available to you here https://www.empowher.com/community/share/posterior-fossa-arachnoid-cyst-cyst-grows-back-brain-it-can-compromise-cerebellum-an.

If you have additional questions, please feel free to ask.

Missie