chemotherapy
Malignant brain tumors are often dealt with through a combination of surgical debulking, radiation, and chemotherapy.  The blood brain barrier may prevent adequate amounts of chemotherapeutic agents from reaching the tumor within the brain.  Some ways of getting around this problem are to open the tight junctions of the cells lining the blood vessels by giving mannitol first, to shrink the cells, giving chemotherapeutic agents directly into the cerebrospinal fluid by lumbar puncture of Ommaya reservoir, or placing chemotherapy impregnated wafers within the cavity in the brain from where the tumor was resected.

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