MedGen

Glioblastomas are malignant astrocytic tumors (grade IV according to the WHO classification). [from ORDO]

A tumor arising from glia in the central nervous system with macroscopic regions of necrosis and hemorrhage. Microscopically, glioblastoma multiforme is characterized by regions of pseudopalisading necrosis, pleomorphic nuclei and cells, and microvascular proliferation. [from HPO]

Astrocytoma is a neoplasm of the central nervous system derived from astrocytes. Astrocytes are a type of glial cell, and thus astrocytoma is a subtype of glioma. [from HPO]

The presence of a glioma, which is a neoplasm of the central nervous system originating from a glial cell (astrocytes or oligodendrocytes). [from HPO]

A benign or malignant neoplasm that arises from or metastasizes to the brain. [from HPO]

A tumor (abnormal growth of tissue) of the nervous system. [from HPO]

A neoplasm composed of neural epithelium, not necessarily a neoplasm located in the neural epithelium or neuroepithelium. [from HPO]

A rare variant of diffuse astrocytoma. It is predominantly composed of neoplastic astrocytes showing a small cell body with few, flaccid processes with a low content of glial filaments and scant GFAP expression. This lesion is not well defined and is considered by some authors as an occasional histopathological feature rather than a reproducibly identifiable variant. When occurring in children, this neoplasm may be difficult to separate from pilocytic juvenile astrocytoma. (Adapted from WHO) [from NCI]

A neoplasm of the central nervous system. [from HPO]

A very rare glial neoplasm of the central nervous system, most often with an intra-axial peripheral supratentorial location in one hemisphere of the frontal or parietal lobes and usually presenting in infants and young adults with symptoms of vomiting, loss of consciousness, epileptic seizures and headaches. [from ORDO]

Oligoastrocytoma is a type of low-grade glioma with a mixed astrocytoma and oligodendroglioma histology, manifesting with headaches, speech and motor problems, seizures and, in some, subarachnoid haemorrhage. [from ORDO]

An astrocytoma that arises from the brain stem. [from NCI]