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  • A rare glial neoplasm with characteristics of extensive infiltration of the brain, often extending to infratentorial structures and even the spinal cord. The neoplasm is composed of elongated glial cells typically resembling astrocytes. Cases in which the predominant cell type is oligodendroglial have also been described. Some neoplasms develop a circumscribed neoplastic mass in addition to the diffuse lesion, usually showing features of high-grade glioma. Clinical symptoms include dementia, headache, seizures, signs of increased intracranial pressure and a variety of neurological deficits. Prognosis is generally poor.
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