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Ependymoma low intermed mag.jpg|
Ependymoma
ICD-10 C71
ICD-9 191.9, 225.0, 237.5
OMIM [1]
DiseasesDB 29452
MedlinePlus [2]
eMedicine med/700
MeSH {{{MeshNumber}}}
File:Ependymom ax T2.jpg
File:Ependymom sag FLAIR.jpg
File:Ependymom cor T1KM.jpg

Ependymoma is a tumor that arises from the ependyma, a tissue of the central nervous system. Usually, in pediatric cases the location is intracranial, while in adults it is spinal. The common location of intracranial ependymoma is the fourth ventricle. Rarely, ependymoma can occur in the pelvic cavity.

Syringomyelia can be caused by an ependymoma. Ependymomas are also seen with neurofibromatosis type II.

MorphologyEdit

File:Myxopapillary ependymoma - high mag.jpg

Ependymomas are composed of cells with regular, round to oval nuclei. There is a variably dense fibrillary background. Tumor cells may form gland-like round or elongated structures that resemble the embryologic ependymal canal, with long, delicate processes extending into the lumen; more frequently present are perivascular pseudorosettes in which tumor cells are arranged around vessels with an intervening zone consisting of thin ependymal processes directed toward the wall of the vessel.[1]

It has been suggested that ependymomas are derived from radial glia.[2]

Ependymoma tumorsEdit

Ependymomas make up about 5% of adult intracranial gliomas and up to 10% of childhood tumors of the central nervous system (CNS). Their occurrence seems to peak at age 5 years and then again at age 35. They develop from cells that line both the hollow cavities of the brain and the canal containing the spinal cord, but they usually arise from the floor of the fourth ventricle, situated in the lower back portion of the brain, where they may produce headache, nausea and vomiting by obstructing the flow of cerebrospinal fluid. This obstruction may also cause hydrocephalus. Other symptoms can include (but are not limited to): loss of appetite, difficulty sleeping, temporary inability to distinguish colors, uncontrollable twitching, seeing vertical or horizontal lines when in bright light, and temporary memory loss. It should be remembered that these symptoms also are prevalent in many other illnesses not associated with ependymoma.

About 85% of ependymomas are benign myxopapillary ependymoma (MPE)[citation needed]. MPE is a localized and slowly growing, low-grade tumor. Although some ependymomas are of a more anaplastic and malignant type, most of them are not anaplastic. For this reason, well-differentiated ependymomas are usually treated with radiation therapy only. For other ependymomas, total surgical removal is the preferred treatment and those that cannot be totally removed also require radiation therapy. The malignant (anaplastic) varieties of this tumor, malignant ependymoma and the ependymoblastoma, are treated similarly to medulloblastoma but the prognosis is much less favorable. Malignant ependymomas may be treated with a combination of radiation therapy and chemotherapy. Ependymoblastomas, which occur in infants and children younger than 5 years of age, may spread through the cerebrospinal fluid and usually require radiation therapy. The subependymoma, a variant of the ependymoma, is apt to arise in the fourth ventricle but may occur in the septum pellucidum and the cervical spinal cord. It usually affects people over 40 years of age and more often affects men than women.

Extraspinal ependymoma (EEP), also known as extradural ependymoma, may be an unusual form of teratoma[3] or may be confused with a sacrococcygeal teratoma.[4]

ReferencesEdit

  1. Cotran, Ramzi S.; Kumar, Vinay; Fausto, Nelson; Nelso Fausto; Robbins, Stanley L.; Abbas, Abul K. (2005). "Ch. 28 The central nervous system" Robbins and Cotran pathologic basis of disease, 7th, St. Louis, Mo: Elsevier Saunders.
  2. Poppleton H, Gilbertson RJ (January 2007). Stem cells of ependymoma. Br. J. Cancer 96 (1): 6–10.
  3. Aktuğ T, Hakgüder G, Sarioğlu S, Akgür FM, Olguner M, Pabuçcuoğlu U (March 2000). Sacrococcygeal extraspinal ependymomas: the role of coccygectomy. J. Pediatr. Surg. 35 (3): 515–8.
  4. Hany MA, Bouvier R, Ranchère D, Bergeron C, Schell M, Chappuis JP, Philip T, Frappaz D (1998). Case report: a preterm infant with an extradural myxopapillary ependymoma component of a teratoma and high levels of alpha-fetoprotein. Pediatric hematology and oncology 15 (5): 437–41.

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