Final answer:
Ependymoblastoma is the highly undifferentiated, aggressive tumor of primordial neuroglial origin that develops in children and is associated with pseudorosettes. It is a highly malignant childhood brain tumor typically affecting children under five. These tumors are characterized by rapid growth and easy spread within the CNS.
Step-by-step explanation:
The aggressive CNS tumor of primordial neuroglial origin that develops in children and is associated with pseudorosettes is known as Ependymoblastoma. It's a highly malignant childhood brain tumor that generally affects children under the age of five. Pseudorosettes, a typical feature of this tumor, are quite distinctive. They appear as rosette-like structures where tumor cells are radially arranged around a central area of neuropil or fibrillar material.
Being a highly undifferentiated tumor, Ependymoblastoma is characterized by very aggressive growth and it tends to spread easily within the central nervous system. This is due to the fact that the cells in this tumor are immature, meaning they are still in very early stages of development. Therefore, they can unpredictably multiply and differentiate into various types of cells.
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