: A type of brain tumor that is derived from oligodendrocytes which are cells in the central nervous system that surround and insulate the long fibers (the axons) through which nerves send their electrical messages.
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A relatively rare, relatively slowly growing glioma derived from oligodendrocytes that occurs most frequently in the cerebrum of adult persons; the neoplasm is grossly homogeneous, fairly well circumscribed, moderately firm, and somewhat gritty in consistency with interstitial calcification sufficiently dense so as to be detected by x-ray imaging of the skull. Microscopically, an o. is characterized by numerous small, round or ovoid, oligodendroglial cells with small, deeply stained nuclei (rarely observed in mitosis), and palely stained, indistinct cytoplasm; the neoplastic cells are rather uniformly distributed in a sparse, fibrillary stroma with scattered calcific bodies and an often prominent arcuate vasculature. [oligo- + G. dendron, tree, + glia, + -oma]
- anaplastic o. an aggressive o. characterized by prominent nuclear pleomorphism, mitoses, and increased cellularity. SYN: pleomorphic o..
- pleomorphic o. SYN: anaplastic o..

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oli·go·den·dro·gli·o·ma -.den-drō-glī-'ō-mə n, pl -mas also -ma·ta -mət-ə a tumor of the nervous system composed of oligodendroglia

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a tumour of the central nervous system derived from a type of glia (the supporting tissue) rather than from the nerve cells themselves. See also glioma.

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ol·i·go·den·dro·gli·o·ma (ol″ĭ-go-den″dro-gli-oґmə) a usually benign neoplasm derived from and composed of oligodendrocytes in varying stages of differentiation; the majority are seen in adults in the white matter of the brain. Called also oligodendroblastoma.

Medical dictionary. 2011.

Look at other dictionaries:

  • Oligodendroglioma — Classification and external resources Micrograph of an oligodendroglioma showing the characteristic branching, small, chicken wire like blood vessels and fried egg like cells, with clear …   Wikipedia

  • Oligodendroglioma — (zona hipodensa u oscurecida de la izquierda), resonancia magnética. Clasificación y recursos externos …   Wikipedia Español

  • oligodendroglioma — m. oncol. Tumor cerebral que deriva de las células de la oligodendroglia y que, en ocasiones, puede tender a la malignidad. Medical Dictionary. 2011. oligodendroglioma …   Diccionario médico

  • oligodendroglioma — noun A glioma believed to originate from the oligodendrocytes of the brain or from a glial precursor cell …   Wiktionary

  • oligodendroglioma — [ˌɒlɪgə(ʊ)ˌdɛndrə(ʊ)glɪ əʊmə] noun (plural oligodendrogliomas or oligodendrogliomata mətə) Medicine a tumour that is derived from oligodendroglia …   English new terms dictionary

  • oligodendroglioma — ol·i·go·den·dro·gli·o·ma …   English syllables

  • oligodendroglioma — n. a tumour of the central nervous system derived from a type of glia (the supporting tissue) rather than from the nerve cells themselves. See also: glioma …   The new mediacal dictionary

  • oligodendroglioma — A rare, slow growing tumor that begins in the oligodendrocytes (brain cells that nourish and support nerve cells). Also called an oligodendroglial tumor …   English dictionary of cancer terms

  • oligodendroglioma — ˌälə̇gōˌdendrōˌglīˈōmə, əˌligəˌde noun (plural oligodendrogliomas or oligodendrogliomata) Etymology: New Latin, from oligodendroglia + oma : a tumor of the nervous system composed of oligodendroglia …   Useful english dictionary

  • anaplastic oligodendroglioma — a malignant type of oligodendroglioma characterized histopathologically by increased cell density, atypical nuclei anaplasia, increased mitotic activity, and necrosis …   Medical dictionary

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