astrocytoma


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Related to astrocytoma: glioma, anaplastic astrocytoma

astrocytoma

 [as″tro-si-to´mah]
a tumor composed of astrocytes; classified in order of malignancy as: Grade I, consisting of fibrillary or protoplasmic astrocytes; Grade II (astroblastoma); Grades III and IV (glioblastoma multiforme).

as·tro·cy·to·ma

(as'trō-sī-tō'mă),
A glioma derived from astrocytes.
[G. astron, star, + kytos, cell, + -oma, tumor]

astrocytoma

(ăs′trō-sī-tō′mə)
n. pl. astrocyto·mas or astrocyto·mata (-mə-tə)
A malignant tumor of nervous tissue composed of astrocytes.

as·tro·cy·to·ma

(as'trō-sī-tō'mă)
A glioma derived from astrocytes; in people younger than 20 years of age, usually arise in a cerebellar hemisphere; in adults, usually occur in the cerebrum, sometimes growing rapidly and invading extensively.
[G. astron, star, + kytos, cell, + -oma, tumor]

astrocytoma

A tumour derived from the supporting tissue of nerve cells (neuroglia). The astrocytoma varies widely in malignancy and rate of growth.

as·tro·cy·to·ma

(as'trō-sī-tō'mă)
A glioma derived from astrocytes; in people younger than 20 years of age, usually arise in a cerebellar hemisphere; in adults, usually occur in the cerebrum, sometimes growing rapidly and invading extensively.
[G. astron, star, + kytos, cell, + -oma, tumor]
References in periodicals archive ?
Astrocytoma is the most common types of glioma diagnosed worldwide, as more than 30% of all the diagnosed cases with brain tumors are astrocytoma.
CEP4 amplification showed sensitivity, specificity, positive predictive level, and negative predictive level at 42.8%, 79.4%, 46.1%, and 77.1%, respectively, for astrocytoma (Table 3).
A case of cerebellar vermis mass in a 4-year-old girl reported as primitive neuroectodermal tumor on radiology proved to be a pilocytic astrocytoma. A case of frontal lobe lesion reported as glioblastoma on MRI turned out to be a tuberculoma on crush smears.
The researchers conclude that their findings suggest that drugs targeting new blood vessel formation given in appropriate doses according to age and tumour grade could prevent astrocytoma growth.
On the other hand 15 (30%) patients from infratentorial group were found to have three characteristic type of tumors including medulloblastoma, ependymoma and astrocytoma. About 9 (60%) patients had medulloblastoma features with 7 (77.8%) patients having high grade and 2 (22.2%) patients having low grade features.
IDH-mutant category is seen in 50-70% of anaplastic astrocytoma [11].
This renders 3 basic groups of IGs (Figure 2): (1) astrocytoma, IDH-mutant; (2) astrocytoma, IDH-wild type; and (3) oligodendroglioma, IDH-mutant and 1p/19q-codeleted.
In the present study, the diagnosis was incorrectly made for five cases of gliomas, where two cases of Grade III Astrocytoma were wrongly diagnosed as cerebral abscess and Metastasis respectively, one case of Grade II astrocytoma was wrongly diagnosed as acute infarct, one case of Oligoastrocytoma was wrongly diagnosed as Meningioma, one case of GBM was wrongly diagnosed as Choroid plexus carcinoma.
In a patient with anaplastic astrocytoma Grade III, elevation of Cho peak value, depression of NAA peak value, with Cho/NAA = 3.72, and visible lactate peak were detected on 1H MRS (b).
Told he would not be able to leave hospital, he was diagnosed with a high grade-two astrocytoma glioma - a type of brain tumour that originates from the brain, rather than from elsewhere.
Pilocytic Astrocytoma Presenting as an Orbital Encephalocele: A Case Report.