MEDULLOEPITHELIOMAS
\mˌɛdəlˌə͡ʊpɪθˌɛlɪˈə͡ʊməz], \mˌɛdəlˌəʊpɪθˌɛlɪˈəʊməz], \m_ˌɛ_d_ə_l_ˌəʊ_p_ɪ_θ_ˌɛ_l_ɪ__ˈəʊ_m_ə_z]\
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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 TUMOR, 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)
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Quinones
- Hydrocarbon rings which contain two moieties position. They can be substituted in any position except at the ketone groups.