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Medulloblastomas
1-5 yr:
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Often arise from inferior medullary velum of the vermis
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Usually presents as a midline tumor
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Spherical pattern of growth, projecting into enlarged 4V
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Hydrocephalus at diagnosis in 95% of case
6-9 yr + older:
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Sometimes mimics cerebellopontine angle tumor
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More often in cerebellar hemispheres