Grading of tumors is defined as a method of evaluating the malignant features of brain tumors. The Grading is from 1 to 4, with a grade 1 tumor representing a slow-growing tumor accompanied by few neuropsychological deficits. Grades 2 and 3 represent intermediate rates of growth and neuropsychological dysfunction. Grade 4 tumors are fast growing and typically have a poor prognosis for recovery.