This chapter provides detail description of Embryonal tumours of the central nervous system. Chapter has 5 well illustrated diagrams and pictures. Embryonal tumors of the central nervous system, medulloblastomas, molecular genetics of medulloblastomas, molecular differences between the different medulloblastoma variants, risk stratification in medulloblastomas, molecular cytogenetic factors and signalling pathway markers, atypical teratoid/rhabdoid tumors, central nervous system primitive neuroectodermal tumors, supratentorial primitive neuroectodermal tumor, medulloepithelioma and ependymoblastoma are described in detail. 75 references are included at the end of the chapter to facilitate further reading.