What are the chances of a non cancer brain tumor to grow again after surgery?

That depends on a: number of different factors. What type of tumor was it?

Ask NeuroSurgeon: The answer differs Depending on the histology and type of benign tumor it was, and whether all the lesion was removed, etc. Ask the Surgeon for the most intelligible answer.

It depends: on the type of tumor and the details of the surgery. What tumor did you have removed?

Too many "if"s!: The answer to this question depends on many things. The first, what is "non cancer brain tumor"? Impossible to answer without specific pathology. Next, how much removed? If the entire tumor was removed at surgery, then less likely than if some was known to be left behind, but by no means rare in the latter case. Several other factors as well. This should be a topic you discuss with your surgeon.