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Oligodendrogliomas, Symptoms and Causes

This type of tumor also arises from the supporting cells of the brain. They are found commonly in the cerebral hemispheres (cerebrum). Seizures are a very common symptom of these tumors, as well as headache, weakness or changes in behavior or sleepiness. These tumors have a better prognosis than most other gliomas, but they can become more malignant with time. About 3 percent of brain tumors are oligodendrogliomas.