I would look for surgeons who have written papers on your specific tumor (as not all tumors are the same, and not all surgeons are skilled in all locations in the brain, tools, techniques etc.) and contact that surgeon or hospital.
I don't know. Some tumors are treated with radiation or chemo - it all depends on the tumor and what it responds to best.
I would look through published papers.
Keep in mind, local hospitals often are affiliated with the larger hospitals (at least here) and consult with the same doctors and use the same treatments. For longer term treatments it may be beneficial to keep travel costs down. So keep options open. Some hospitals may have satellite (smaller) hospitals in other locations as well. I am just not familiar with how it works in Europe so hopefully someone else can chime in.
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