My name is Mason Ermis. When I was 9 years old, I began a journey that tested my courage and strength in ways I never thought possible. We came to MD Anderson after my primary doctor diagnosed me with Diabetes insipidus, which is sometimes caused by a brain tumor. 

After an MRI at MD Anderson Children’s Cancer Hospital, we learned I had a small “spot” in my brain, near my pituitary gland, and another spot near my optic nerve...