Call your doctor and ask him/her. Your doctor will explain. If not, I would get a 2nd opinion. Where do you go? I would look on the US News and World Report website to see which hospitals in your area are highest in neurology and go there. I went to a local hospital and then switched to Cleveland Clinic. It is one of the best in the Us (I think it's #4 for neurology). It is SO completely different, and SO much better than the local hospital. Wish I had gone there in the first place!
I don't know "medical talk", but a glioma is cancer. A grade 2 is the same as a low grade. They both mean it is a slow growing tumor.
I have a grade 3 oligodendroglioma. This type of tumor is slow growing, but when it becomes grade 3, it grows faster. Mine has been stable since September 2011.