Source:http://linkedlifedata.com/resource/umls/id/C0206663
MSH: A group of malignant tumors of the nervous system that feature primitive cells with elements of neuronal and/or glial differentiation. Use of this term is limited by some authors to central nervous system tumors and others include neoplasms of similar origin which arise extracranially (i.e., NEUROECTODERMAL TUMORS, PRIMITIVE, PERIPHERAL). This term is also occasionally used as a synonym for MEDULLOBLASTOMA. In general, these tumors arise in the first decade of life and tend to be highly malignant. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, p2059),NCI: A type of cancer that arises from a particular type of cell within the brain or spinal cord.,NCI: An aggressive malignant embryonal neoplasm arising from the central nervous system. This category includes ependymoblastoma, medulloepithelioma, and supratentorial primitive neuroectodermal tumor. It usually follows an aggressive clinical course.