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Primary tumors may be malignant or nonmalignant.
Malignant, or high-grade, tumors contain cancer cells. They grow rapidly and invade the healthy tissue around them. Eventually, a malignant tumor will crowd out or destroy the normal cells and interfere with their function. Malignant tumors are life-threatening.
Nonmalignant, or low-grade, tumors may also invade surrounding tissue, or coexist with normal cells. Despite this they can cause severe neurologic impairment, such as seizures, behavioral changes and memory loss, and can interfere with normal, vital brain functions. Some low-grade brain tumors are life-threatening.
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