NCIt definition : A tumor composed of two or more glial cell types (astrocytes, ependymal cells, and
oligodendrocytes).;
Alternative definition : NCI-GLOSS: A brain tumor that forms from more than one type of brain cell, usually
astrocytes and oligodendrocytes.; CDISC: A malignant neoplasm comprising two or more glial cell types (e.g., astrocytes,
ependymal cells, oligodendrocytes).;