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U.S. National Institutes of Health National Cancer Institute
Dictionary of Cancer Terms
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medulloblastoma (MED-yoo-loh-blas-TOH-muh)

 A malignant brain tumor that begins in the lower part of the brain and that can spread to the spine or to other parts of the body. Medulloblastomas are a type of primitive neuroectodermal tumor (PNET).

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