Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Childhood Central Nervous System Embryonal Tumors ?
    ### Response:
    Key Points 
                    - Central nervous system (CNS) embryonal tumors may begin in embryonic (fetal) cells that remain in the brain after birth.     - There are different types of CNS embryonal tumors.    - Pineoblastomas form in cells of the pineal gland.
    