astrocytoma

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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

/as·tro·cy·to·ma/ (as″tro-si-to´mah) a tumor composed of astrocytes; the most common type of primary brain tumor and also found throughout the central nervous system, classified on the basis of histology or in order of malignancy (Grades I–IV).

astrocytoma

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

astrocytoma

pl. astrocytomas, astrocytomata [as′trōsītō′mə]
Etymology: Gk, aster + kytos + oma
a primary tumor of the brain composed of astrocytes and characterized by slow growth, cyst formation, invasion of surrounding structures, and often development of a highly malignant glioblastoma, within the tumor mass. Complete surgical resection of an astrocytoma may be possible early in the development of the tumor. It may also be treated with radiation therapy postoperatively or if surgery is not possible. Also called astrocytic glioma.
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Astrocytoma

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]

astrocytoma (as´trōsītō´mə),

n a primary tumor of the brain composed of astrocytes and characterized by slow growth, cyst formation, invasion of surrounding structures, and often, the development of a highly malignant glioblastoma within the primary tumor mass.

astrocytoma

a common intracranial tumor composed of astrocytes; classified in order of malignancy as differentiated or undifferentiated groups.

gemistocytic astrocytoma
comprises gemistocytic astrocytes, plump or swollen astrocytes or gemistocytes.
References in periodicals archive ?
One-year survival rate was worst for grade 3 and 4 astrocytomas (67% and 39.
Within the IDH-wild-type set of astrocytomas including GBM, methylation data have also revealed a group distinct from those enriched for tumors previously described as "classical" and "mesenchymal.
In patients aged between 20 and 40 years, Meningiomas accounted for 7 cases, Astrocytomas accounted for 6 cases, Schwannomas for 3 cases, Tuberculomas for 2 cases.
Secondary GB develop slowly from diffuse astrocytoma WHO grade II or anaplastic astrocytoma (WHO grade III).
Variations in the natural history and survival of patients with supratentorial low-grade astrocytomas.
Keywords: Angiomyolipoma, rhabdomyoma, subependymal giant cell astrocytoma, tuberosclerosis, tumor
Survival curves show a poor survival experience within the first few years of diagnosis for gliomas (NOS), diffuse astrocytomas, anaplastic astrocytomas and GBM, and a better survival experience for oligoastrocytic tumours, anaplastic oligodendrogliomas, oligodendrogliomas and all other tumours.
In this presentation, clinical and radiological findings of subependymal giant cell astrocytoma and cortical tubers leading to new onset seizures will be discussed.
It has been reported that up to 30 percent of intramedullary astrocytomas do not enhance.
et al (2011) [9] in Nepal noticed that astrocytomas were most common tumors of CNS followed by meningiomas which was contrary to our findings.
Regarding the clinical spectrum of tuberous sclerosis it was seen that epileptic fits and cardiac complications were seen in 50% patients each eye abnormalities including retinal astrocytomas were seen in 40% patients mental retardation was seen in 25% patients followed by astrocytomas and pulmonary disease seen in 20% patients each.
The most common types of brain tumour in children are astrocytomas, medulloblastomas, ependymomas and brain stem gliomas.