what causes plac on the brain
1. Gliomas. Approximately 30-percent of all brain tumors are glioma tumors, which originate in the brain or spine. Gliomas also make up 80-percent of all malignant brain tumors. This tumor is named glioma because it develops in the glial cellsâspecifically the astrocytoma, ependymoma, oligodendroglioma cells, or a combination of these. As a glioma brain tumor grows, it may cause headaches, nausea and vomiting, seizures, and vision problems if it places pressure on the optic nerve.