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ICP monitors In contrast to the pseudorosettes of an ependymoma, the pseudorosettes of medulloblastomas are GFAP negative. Medulloblastomas with a nodular pattern (desmoplastic variant is the most common variant found in adults). Medulloblastomas are the great "mimics", demonstrating a variety of appearances on imaging studies. www.ucsf.edu /nreview/06.4-Oncology-HistologicalType/Medulloblastoma.html   (1672 words)

AANS.org | Education and Meetings | AANS Scientific Journals | Neurosurgical Focus Medulloblastoma, the most common malignant brain tumor in children, is the pediatric brain tumor most extensively studied at the molecular level. Because medulloblastoma is thought to arise from primitive neuroepithelial stem cells, neurotrophins and their receptors may be important in the development and growth of these tumors. In one study of medulloblastoma cell lines, all were found to express IGF receptor--1.[12] Blocking of ligand binding with a monoclonal antibody to the extracellular portion of the receptor inhibited growth of the cells in vitro. www.aans.org /education/journal/neurosurgical/august99/7-2-2.asp   (3895 words)

Medulloblastoma Congenital disseminated malignant rhabdoid tumor and cerebellar tumor mimicking medulloblastoma in monozygotic twins: pathologic and molecular diagnosis. Medulloblastoma is a rare adult primary brain tumor for which limited retrospective studies are available to elucidate natural history or to guide therapy. Medulloblastomas, for example, are the most common malignant brain tumour of childhood, but their pathogenesis is unknown, their relationship to other embryonal CNS tumours is debated, and patients' response to therapy is difficult to predict. www.thedoctorsdoctor.com /diseases/medulloblastoma.htm   (8619 words)

Learn About Medulloblastoma Medulloblastoma is a brain cancer that occurs in children and young adults. Medulloblastoma can spread to nearby parts of the brain and spinal cord, but not usually to other parts of the body. Although this test is not used for the diagnosis of medulloblastoma, it may be in the future. www.massgeneral.org /cancer/crr/types/brain/child/medulloblastoma.asp   (1012 words)

Medulloblastoma - My Child Has - Children's Hospital Boston Within the cerebellum, medulloblastomas are most often seen in the region of the fourth ventricle/vermis, or the central part of the cerebellum, and less frequently they arise within the cerebellar hemispheres. Medulloblastomas have a peak incidence between the ages of 3 and 8 but can be seen anywhere from the newborn/infant up into adulthood. Typically, medulloblastomas are divided into three groups: infants (children under the age of 3), standard risk (no evidence of disease outside of the posterior fossa of the brain with a complete removal of the tumor) and high risk (evidence of incomplete removal or tumor spread elsewhere in the nervous system). www.childrenshospital.org /az/Site1286/mainpageS1286P0.html   (1558 words)

Medulloblastoma : Cancerbackup Medulloblastomas are malignant tumours formed from poorly developed cells at a very early stage of their life. Medulloblastoma is much more common in children than adults, and treatment is often given at an important time in a child’s development. As medulloblastoma may spread through the CSF to the spinal cord, radiotherapy is given to the brain and spinal cord. www.cancerbackup.org.uk /Cancertype/Brain/Typesofbraintumour/Medulloblastoma   (1516 words)

07 Medulloblastoma : BC Cancer Agency Medulloblastomas or posterior fossa primitive neuroectodermal tumors are aggressive tumors characterized histologically by small dark cells with scanty cytoplasm. Medulloblastomas are well known for their propensity for spread through the craniospinal axis. Medulloblastomas are treated with surgical resection, followed by craniospinal radiation with or without chemotherapy. www.bccancer.bc.ca /HPI/CancerManagementGuidelines/NeuroOncology/ManagementPolicies/Medulloblastoma.htm   (663 words)

Medulloblastoma Medulloblastoma is a cancerous (malignant) tumor of the lower part of the brain (infratentorial [posterior fossa] tumor) that is derived from immature nerve cells known as neuroblasts (i.e., primitive neuroectodermal tumor [PNET]). Medulloblastomas generally arise in the back (posterior), mid region (i.e., vermis) of the cerebellum, which is the part of the brain behind the brain stem involved in coordinating voluntary movements and regulating balance and posture. The treatment of medulloblastoma may require the coordinated efforts of a team of medical professionals, including pediatricians; specialists in diseases of the nervous system (neurologists), the diagnosis and treatment of cancer (medical oncologists), and the use of radiation in the treatment of cancer (radiation oncologists); oncology nurses; neurosurgeons; and/or other health care professionals. hw.healthdialog.com /kbase/nord/nord300.htm   (2555 words)

Medulloblastoma Mouse Models - The Jackson Laboratory Medulloblastomas are the most common pediatric tumor of the posterior fossa(1). Though there has been significant progress using mouse models to study medulloblastomas, the molecular and genetic basis of the disease is not clearly understood. Histological analysis shows that 30% of brain tumors are localized in the cerebellum, and large tumors often compress the cerebellar hemispheres and invade the fourth ventricle(2). jaxmice.jax.org /library/notes/489i.html   (556 words)

JSMF - Researching Brain Cancer: 2005 Research Awards Both medulloblastomas and glioblastomas are resistant to radiation and chemotherapies, underscoring the importance of developing novel therapies targeted specifically at fighting these tumors. Based on these similarities, it is hypothesized that medulloblastomas and gliomas are derived from precursor cells that persist in postnatal and adult brains. The suspected glial origin of gliomas and granule cell origin of medulloblastomas suggest that cells in these tumors share a common molecular makeup with their normal counterparts and that understanding the biology of one will contribute to a better understanding of the other. www.jsmf.org /grants/bc/essays/2005/hebert.htm   (1177 words)

AboutKidsHealth: Brain Tumours: Medulloblastomas   (Site not responding. Last check: 2007-11-01) A medulloblastoma is the most common cancerous (malignant) brain tumour in children. This part of the brain coordinates movement, balance, and posture and also participates in some of the functions of the cerebrum in ways that are not fully understood. There is growing evidence that medulloblastoma is the result of a mistake that occurred in the early development of the brain’s cells. www.aboutkidshealth.ca /clinicalAreas.asp?pageContent=BT-nh2-03   (958 words)

RedOrbit - Science - Prognosis-Related Molecular Markers in Pediatric Central Nervous System Tumors   (Site not responding. Last check: 2007-11-01) TP53: In 1993, a study of 87 medulloblastomas found that intense nuclear overexpression of p53 protein was a harbinger of significantly reduced survival (p = 0.002), and identified a group or patients with a 7-fold relative risk of death compared to all other cases (33). DNA Ploidy: Regarding the influence of ploidy on medulloblastoma outcome, studies of approximately 200 cases have correlated diploid lesions with a more aggressive course and significantly greater tendency for distant metastases and death compared with better outcome for aneuploid tumors (64-68). Prognostic importance of DNA ploidy in medulloblastoma of childhood. www.redorbit.com /news/display?id=109738   (5759 words)

Stem Cells Found In Cerebellum; Possible Cell Of Origin For The cerebellum is the brain's control center for motor coordination and cognitive function, yet little has been known about the origins of the neurons and supporting "glial" cells that populate this region. Medulloblastomas arise in the cerebellum but their cells of origin have remained unclear. Other research teams have shown that certain genes are mutated in medulloblastoma, but it has not been clear in which particular cells these genes are mutated. www.bioresearchonline.com /content/news/article.asp?docid={1602AE49-955A-44EB-93DC-29ABA7A8DDD1}&VNETCOOKIE=NO   (732 words)

News Story: Full Text Childhood medulloblastomas have been suspected to be biologically different from adult tumors, though comparative studies are sparse in the literature. A total of 181 medulloblastomas were studied with respect to clinical and histological characteristics, MIB-1 labeling index (MIB-1 LI), apoptotic index (AI), ratio of apoptotic to LI, p53 and Bcl-2 protein expressions. Adult medulloblastomas were biologically less aggressive, having lower growth rate parameters (mean MIB-1 LI 19.1 +/- 15.7; AI 3.73 +/- 2.71 and AI:LI 0.207 +/- 0.162) as compared to childhood tumors (mean MIB-1 LI 28.3 +/- 20.4; AI 2.86 +/- 2.14 and AI:LI 0.108 +/- 0.111). www.virtualtrials.com /news3.cfm?item=1757   (285 words)

Brain Tumor Types: The Brain Tumor Program at University Hospital, Newark, NJ Medulloblastomas, which are malignant, represent more than one-fourth of all childhood brain tumors. Medulloblastomas can spread throughout the nervous system and, while not a common occurrence, to other parts of the body. As most of these tumors are located in the cerebellum, muscle coordination—particularly during walking—may be affected. www.theuniversityhospital.com /braintumor/html/braintumortypes/typesoftumors.htm   (2822 words)

OHSU Health - Brain Tumors   (Site not responding. Last check: 2007-11-01) Medulloblastomas are one type of PNET that are found near the midline of the cerebellum. This tumor is rapidly growing and often blocks drainage of the CSF (cerebral spinal fluid, which bathes the brain and spinal cord), causing symptoms associated with increased ICP. Medulloblastoma cells can spread (metastasize) to other areas of the central nervous system, especially around the spinal cord. www.ohsuhealth.com /htaz/pageFinder.cfm?pageid=P00775   (2832 words)

Varian Medical Systems: Cancer Patients: Brain Cancer Medulloblastomas were once thought to develop from glial cells. For this reason, medulloblastomas are sometimes called primitive neuroectodermal tumors (PNET). Most medulloblastomas arise in the cerebellum; however, they may occur in other areas as well. www.varian.com /pinf/cty103d-2.html   (314 words)

Expression of a human polyomavirus oncoprotein and tumour suppressor proteins in medulloblastomas -- Del Valle et al. ... Medulloblastomas and the human neurotropic polyoma virus JC virus. p53 gene mutation and mdm2 gene amplification are uncommon in medulloblastoma. Molecular genetic studies in medulloblastomas: evidence for tumor suppressor genes at the chromosomal regions 1q31–32 and 17p13. mp.bmjjournals.com /cgi/content/full/54/5/331   (3542 words)

Genomic Amplification of Orthodenticle Homologue 2 in Medulloblastomas -- Boon et al. 65 (3): 703 -- Cancer Research   (Site not responding. Last check: 2007-11-01) Genomic Amplification of Orthodenticle Homologue 2 in Medulloblastomas -- Boon et al. Genomic Amplification of Orthodenticle Homologue 2 in Medulloblastomas Medulloblastomas are a frequently studied brain cancer occurring cancerres.aacrjournals.org /cgi/content/full/65/3/703   (3011 words)

Table of Contents The aim of this study was to localize the targeted deletion regions on the three aforementioned chromosomes in medulloblastomas. The DNA extracted from the tumors and corresponding normal blood samples were amplified independently in the presence of radioactively labeled microsatellite primers, resolved by denaturing gel electrophoresis and processed for autoradiography. These results indicate that DMBT1 is closely associated with the oncogenesis of medulloblastomas and highlight regions of loss on chromosomes 11p and 16q for further fine mapping and cloning of candidate tumor suppressor genes that are important for the genesis of medulloblastoma. www.thejns-net.org /jns/issues/v94n5/abs/n0940799_r.html   (361 words)

Children's National Medical Center - Children's Hospital Washington D.C. - Program Display New approaches exist for children with medulloblastomas, brain stem gliomas, high-grade gliomas, low-grade gliomas, infantile malignant and benign brain tumors and ependymomas. Children's is a leader in studies highlighting the improving outcome of children with medulloblastomas. This has led to a new generation of studies reducing therapies for some types of brain tumor, such as nondisseminated medulloblastomas, and low-grade tumors in attempts to reduce sequelae of the therapy and improve quality of life. www.cnmc.org /dcchildrens/about/ProgramDisplay.aspx?ProgramId=318   (268 words)

Gene amplification in PNETs/medulloblastomas: mapping of a novel amplified gene within the MYCN amplicon -- ... Twenty medulloblastomas and five supratentorial PNETs were analysed by RLGS for the presence of DNA amplification. Medulloblastoma in children: a correlation between staging and results of treatment. N-myc gene expression and oncoprotein characterisation in medulloblastoma. jmg.bmjjournals.com /cgi/content/full/37/7/501   (5198 words)

Brain cancer, supratentorial primitive neuroectodermal and pineal tumors, childhood: Treatment - Health Professional ...   (Site not responding. Last check: 2007-11-01) Undifferentiated neuroectodermal tumors of the cerebellum have historically been referred to as medulloblastomas, while tumors of identical histology in the pineal region are diagnosed as pineoblastomas, and cortical lesions have been called central neuroblastomas or cortical primitive neuroectodermal tumors. Studies have suggested that the tumor cells of medulloblastomas and supratentorial primitive neuroectodermal tumors have different molecular genetic aberrations.[1,2] This group also includes some tumors formerly called central neuroblastomas. In such a system, medulloblastoma is referred to as primitive neuroectodermal tumor and then subdivided on the basis of cellular differentiation. www.webmd.com /hw/brain_cancer/ncicdr0000062775-cellular-classification.asp   (424 words)

Amy Grant Has Faith About Defeating Pediatric Cancers - DrDonnica.com - The First Name in Women's Health Medulloblastoma is a brain tumor that occurs in the cerebellum, near the back of the head. Unlike most brain tumors, which remain confined to the head, medulloblastoma is a very aggressive disease that spreads throughout the brain, down the spine and to other parts of the body. The average age of diagnosis for medulloblastoma is six years. www.drdonnica.com /display.asp?article=8499   (1306 words)

Advances in the Diagnosis, Molecular Genetics, and Treatment of Pediatric Embryonal CNS Tumors -- MacDonald et al. 8 ... Metastasis stage, adjuvant treatment, and residual tumor are prognostic factors for medulloblastoma in children: conclusions from the Children’s Cancer Group 921 randomized phase III study. A clinicopathologic and immunohistochemical analysis of 53 cases of medulloblastoma with emphasis on synaptophysin expression. Molecular cytogenetic analysis of medulloblastomas and supratentorial primitive neuroectodermal tumors by using conventional banding, comparative genomic hybridization, and spectral karyotyping. theoncologist.alphamedpress.org /cgi/content/full/8/2/174   (5821 words)

Untitled Document Medulloblastomas and PNETS arise from remnants of primitive neuro-ectoderm in the roof of the fourth ventricle. These tumors are very malignant and exhibit an aggressive biologic behavior, commonly invading the adjacent brain stem and leptomeninges. Medulloblastomas are primarily midline vermian lesions, but hemispheric locations are also possible. spinwarp.ucsd.edu /NeuroWeb/Text/br-369.htm   (165 words)

Genetics Society - Induction of medulloblastomas ...   (Site not responding. Last check: 2007-11-01) Since EGL cells appear normally to be specified to produce only granule neurons, the observation of both neuronal and glial differentiation has led to the suggestion that they might be derived from multipotent cells of the subependymal layer. While this study does shed light upon the potential origin of medulloblastomas, the authors point out that neither P53 nor Rb genes are generally disrupted in sporadic medulloblastomas found in humans. As for a role in glial tumours, the authors suggest that there may have been insufficient time for these tumours to develop due to the premature sacrifice of the mice (due to medulloblastoma formation) or that mouse glial cells are remarkably resistant to neoplastic transformation. www.genetics.org.uk /induction_of_medulloblastomas   (544 words)

[Brainlife] TONG CY et al (2004) - Detection of oncogene amplifications in medulloblastomas by comparative genomic ... The aim of this study was to detect common oncogenes involved in medulloblastoma tumorigenesis. The gain in gene copy numbers was confirmed in 34 additional archival medulloblastoma cases by using fluorescence in situ hybridization analysis. This is the first genome-wide survey of multiple oncogene amplifications involved in the development of medulloblastoma. www.brainlife.org /abstract/tong_200402.htm   (358 words)

Better Model Of Deadly Brain Cancer Alt and his colleagues produced the mouse model of medulloblastoma by knocking out a gene called XRCC4, which produces a protein that plays an important role in stitching together the ends of broken DNA. While their earlier studies involved knocking out the XRCC4 gene throughout the animals' bodies, now “the major goal was to eliminate this protein only in the developing nervous system, so we could specifically determine whether there was a role for nonhomologous end-joining in suppressing cancers of cells besides those of the immune system,” he said. Other mouse models of medulloblastoma have been created by knocking out patched or other individual genes that have been implicated in the development of medulloblastoma. www.medicalnewstoday.com /medicalnews.php?newsid=42352   (972 words)

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