Listen carefully to what may happen if the tumor is removed. I had a diffuse astrocytoma grade 2 removed from my left cerebellum in March 2017. It was discovered (but called a cyst or low grade unidentified growth) 20 years earlier but my doctors said not to worry about it and did not check it again until 2017 when I began getting dizzy and dropping things. I am sure surgery saved my life, but my life isn't all that great because of the location of the tumor and the damage done by surgery and radiation. I've lost my standing and walking balance and left side coordination of my arm and hand, and my eyes won't focus. I can't drive or do the art work or gardening I once did. My head is extremely sore where they did the surgery. I live 2,000 miles from Mayo and can't seem to find any local medical professionals to help me.
Would I do it again? Ask me in another year. My advice is to get multiple second opinions to try to determine what will happen if you do nothing, and how you will function after surgery, radiation, and chem takes at least a year of your life. Good luck.