Glioma [Disease/Finding] Medulloblastoma [Disease/Finding] M0013281 C0025149 D008527 Medulloblastoma A malignant neoplasm that may be classified either as a glioma or as a primitive neuroectodermal tumor of childhood (see NEUROECTODERMAL TUMOR, PRIMITIVE). The tumor occurs most frequently in the first decade of life with the most typical location being the cerebellar vermis. Histologic features include a high degree of cellularity, frequent mitotic figures, and a tendency for the cells to organize into sheets or form rosettes. Medulloblastoma have a high propensity to spread throughout the craniospinal intradural axis. (From DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2060-1) Medulloblastoma N0000001964 1026852 C4106 83217000 Neuroectodermal Tumors, Primitive [Disease/Finding]