Brain tumor grading is based on how the cells look under a microscope and how fast they grow. Grade 1 cells look and grow most like healthy brain cells, while grade 3 cells are show more change and grow faster.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Send a note of thanks to Mayo Clinic researchers who are revolutionizing healthcare and improving patient outcomes.