A tumor grade is a way to categorize a tumor and will help members of the healthcare team enquire about more clearly about the tumor, determine treatment options, and prophesy outcomes. Tumors are assigned Grade I, II, III, or IV based on abnormalcy of the cells they contain. A tumor can bear more than one grade of cell. The highest, or most improvement, grade of cell determines the tumor’s grade, even if most of the tumor is made up of lower-grade cells. Grade I: These are the least improvement tumors and are usually associated with long-term survival. They grow slowly and have an almost normal countenance when viewed through a microscope. Grade II: These tumors are slow growing and look slightly extraordinary under a microscope. Some can spread into nearby normal tissue and recur, now and again as a higher grade tumor. Grade III: These tumors are fatal, although there is not always a momentous difference between grade II and grade III tumors. The cells of a grade III tumor are actively reproducing abnormal cells and spreading into adjacent normal brain tissue. These tumors be disposed to recur, often as a grade IV. Grade IV: These are the most malignant tumors. They simulate quickly, can have a bizarre appearance when viewed under the microscope, and easily fall into nearby normal brain tissue. These tumors form new blood vessels so they can keep up their rapid growth.