Brain Tumor (cont.)
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What are the tumor grades and types?
When most normal cells grow old or get damaged, they die, and new cells take their place. Sometimes, this process goes wrong. New cells form when the body doesn't need them, and old or damaged cells don't die as they should. The buildup of extra cells often forms a mass of tissue called a growth or tumor.
Primary brain tumors can be benign or malignant:
Benign brain tumors do not contain cancer cells:
Malignant brain tumors (also called brain cancer) contain cancer cells:
Doctors group brain tumors by grade. The grade of a tumor refers to the way the cells look under a microscope:
Cells from low-grade tumors (grades I and II) look more normal and generally grow more slowly than cells from high-grade tumors (grades III and IV).
Over time, a low-grade tumor may become a highgrade tumor. However, the change to a high-grade tumor happens more often among adults than children.
Medically Reviewed by a Doctor on 3/14/2014
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