Lly found in adolescents or young adults within the temporal lobe or hypothalamus. cheap viagra online india Anaplastic variants occur. A variety of names had been used to describe neoplasms composed mainly of neurons, varying in the degree of differentiation.
Gangliocytoma is composed of mature ganglion cells. (figure 14) and central neurocytoma is a well differentiated neoplasm has been described in young adults, usually within the lateral ventricles, composed of uniform round cells with immunohistochemical and ultra structural features of neuronal differentiation.
This lesion carries a favourable prognosis after resection.
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(figure 15). Dysembryoplastic neuroepithelial tumour is a benign neoplasm showing mixed glial/neuronal differentiation, occurring within the supratentorial region and often associated with cortical dysplasia. It usually corresponds to grade 1 and usually does not recur after surgical resection. Desmoplastic infantile ganglioglioma is a neoplasm of infancy and contains a dense fibrous stromal component and usually shows a favourable course after surgery.
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Dysplastic gangliocytoma of the cerebellum is composed of cells that resemble purkinje cells; it may be associated with a variety of congenital malformations and may be familial. Olfactory neuroblastoma occurs at the roof of the nose and is composed of immature neuronal cells. It tends to infiltrate adjacent structures. Medulloblastoma is the commonest tumour of the central nervous system in children and usually occurs in the cerebellum.
It is composed of cells with hyperchromatic nuclei surrounded by small amounts of cytoplasm; the nuclei are often slightly elongated. The histological pattern is variable and may show differentiation to a variety of cell types including neuronal, glial, ependymal, melanin-producing cells, or rhabdomyoblasts. Another rare variety form contains abundant collagen and is referred to as the desmoplastic form. (figure 16). Meningiomas meningiomas are derived from the meninges and account for approximately 15% of primary intracranial neoplasms. They occur in adult life and are approximately twice as common in females as males. They are derived from arachnoidal endothelial cells and occur wherever arachnoidal villi are found. viagra use tips The commonest site is adjacent to the sagittal sinus (figure 17). They may be multiple. They usually show evidence of slow progressive growth but malignant transformation can occur.
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A variety of types have been described and they usually show some evidence of whorling. cheap viagra online india The patterns most commonly found are: meningothelial - solid lobules of cells showing little or no evidence of whorl formation (figure 18). Fibrous - composed mainly of spindle shaped cells resembling fibroblasts (figure 19). Transitional - this shows a mixed pattern with areas of spindle shaped cells situated between endothelial cell whorl (f. viagra tablets price rupees
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