What Does This MRI Report Indicate?

I was recently given results from my MRI last week stating that the findings suggest an exophytic brain stem glioma presumably low grade.. how accurate are MRI s and are there treatments out there that can help me if it is in fact what the report says it is? I have a neurologist appointment scheduled in another 2 weeks but my mind is going all over the place with worry and fear. I am a 26 YO Female. The reason for MRI was because of throbbing pain in my head when straining or bending over. Have had frequent migraines the last 2 years or so.