grade IV astrocytoma

grade IV astrocytoma
A fast-growing type of central nervous system tumor that forms from glial (supportive) tissue of the brain and spinal cord and has cells that look very different from normal cells. Grade IV astrocytoma usually occurs in adults and affects the brain more often than the spinal cord. Also called glioblastoma, glioblastoma multiforme, and GBM.

English dictionary of cancer terms . 2015.

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  • astrocytoma fibrillare — fibrillary astrocytoma an astrocytoma whose cells resemble fibrous astrocytes, usually a Grade I or Grade II astrocytoma found in the cerebrum of an adult, but occasionally occurring in the brainstem or cerebellum. A minority are malignant and… …   Medical dictionary

  • Astrocytoma — Caption = Two images the above of which shows a normal brain and the below shows astrocytoma. OMIM = 137800 OMIM mult = MedlinePlus = eMedicineSubj = med eMedicineTopic = 2693 DiseasesDB = 29449 Astrocytomas are primary central nervous system… …   Wikipedia

  • astrocytoma — A glioma derived from astrocytes. [G. astron, star, + kytos, cell, + oma, tumor] anaplastic a. intermediate grade a. characterized by increased cellularity, nuclear pleomorphism, mitoses, and variable …   Medical dictionary

  • Pilocytic astrocytoma — Caption = OMIM = OMIM mult = MedlinePlus = eMedicineSubj = radio eMedicineTopic = 367 DiseasesDB = MeshID = D001254 Pilocytic astrocytoma, or juvenile pilocytic astrocytoma, is a brain tumor that occurs predominantly in children and involves the… …   Wikipedia

  • anaplastic astrocytoma — a malignant to highly malignant form of astrocytoma that often degenerates into a glioblastoma; variously classified as a Grade II or a Grade III astrocytoma …   Medical dictionary

  • diffuse cerebellar astrocytoma — a cerebellar astrocytoma that is solid, dense, and infiltrative and resembles a fibrillary astrocytoma; it occurs more frequently in adults and has a higher grade of malignant potential than a pilocytic astrocytoma …   Medical dictionary

  • cerebellar astrocytoma — an astrocytoma in the cerebellum; the most common kind, the juvenile pilocytic a., has a low grade of malignancy, but a second variety, the diffuse cerebellar a., is of a higher grade …   Medical dictionary

  • malignant astrocytoma — an astrocytoma of Grade III or Grade IV; see anaplastic a. and glioblastoma …   Medical dictionary

  • juvenile pilocytic astrocytoma — a pilocytic astrocytoma found in the cerebellum in children, one of the most common juvenile brain tumors; it grows slowly and has a low grade of malignancy …   Medical dictionary

  • pilocytic astrocytoma — an astrocytoma resembling the fibrillary type but with its fibrils arranged in parallel rows; its grade of malignancy is low. The most common kind is the cerebellar juvenile pilocytic a. In adults the pilocytic type is usually found in the… …   Medical dictionary

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