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Treatment of Brain Tumor
Surgery is the most frequent approach to treating brain tumours. Such surgery may be curative for some cancers, but for others it may only relieve symptoms and prolong survival. In many cases, complete removal of the tumour is not possible.
Radiation therapy may be used to cure some brain cancers, but others do not respond to radiotherapy. Radiation generally works best with fast-growing types. Because radiation therapy typically involves X rays, which pose a risk to healthy brain tissue, it is important to minimize exposure to the normal cells surrounding the tumour. This is accomplished by employing special procedures that focus the radiation. For instance, a device called a gamma knife, which emits a highly controllable beam of radiation, may be used. Even when radiation is localized, however, radiotherapy can cause side effects such as vomiting, diarrhea, or skin irritation. Radiation to the brain may cause scar tissue to form and potentially cause future problems. Memory loss may also occur.
Chemotherapy is used for some brain tumours, but, owing to the brain's protective barrier, many chemotherapeutic agents cannot enter the brain from the bloodstream. Chemotherapy works best on fast-growing tumours, but it is generally not curative and causes side effects similar to radiation therapy. Both radiation therapy and chemotherapy are often used when a person's general health or the location of the tumour prevents surgery.
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