What is the most common malignant CNS childhood tumor?

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What is the most common malignant CNS childhood tumor?

Medulloblastoma is the most common malignant brain tumor in children. It is a primitive neuroectodermal tumor that typically originates in the cerebellum (posterior fossa) and often presents with signs of increased intracranial pressure and cerebellar symptoms like ataxia. A key feature is its tendency to disseminate through the cerebrospinal fluid, so thorough staging includes imaging of the spine. Because it is malignant, treatment goes beyond surgery to include craniospinal irradiation and chemotherapy, usually after maximal safe tumor resection. This distinguishes it from pilocytic astrocytoma, which is the most common pediatric brain tumor overall but is benign, while choroid plexus and glioneuronal tumors are less common malignant entities.

Medulloblastoma is the most common malignant brain tumor in children. It is a primitive neuroectodermal tumor that typically originates in the cerebellum (posterior fossa) and often presents with signs of increased intracranial pressure and cerebellar symptoms like ataxia. A key feature is its tendency to disseminate through the cerebrospinal fluid, so thorough staging includes imaging of the spine. Because it is malignant, treatment goes beyond surgery to include craniospinal irradiation and chemotherapy, usually after maximal safe tumor resection. This distinguishes it from pilocytic astrocytoma, which is the most common pediatric brain tumor overall but is benign, while choroid plexus and glioneuronal tumors are less common malignant entities.

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