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</topic><topic id="https://vocabulario.abcd.usp.br/pt-br/?tema=62854"><instanceOf><topicRef xlink:href="#term"/></instanceOf><baseName><baseNameString>MEDULOBLASTOMA</baseNameString></baseName>  <occurrence>    <instanceOf>      <topicRef xlink:href="#scope-note"/>    </instanceOf><baseName><baseNameString><![CDATA[ Neoplasia maligna podendo ser classificada tanto como glioma ou como tumor neuroectodérmico primitivo da infância (v. Tumores Neuroectodérmicos Primitivos). O tumor ocorre mais frequentemente na primeira década de vida sendo que a localização mais típica é o verme cerebelar. Entre as características histológicas estão alto grau de celularidade, figuras mitóticas frequentes e tendência das células a se organizar em camadas ou em rosetas. O meduloblastoma tem uma alta propensão de disseminação ao longo do eixo intradural cranioespinhal. (Tradução livre do original: DeVita et al., Cancer: Principles and Practice of Oncology, 5th ed, pp2060-1).<p>Fonte: DeCS server. Disponível em: http://decs.bvs.br.<p> ]]></baseNameString></baseName>  </occurrence></topic>  <association>    <instanceOf>      <topicRef xlink:href="#broader-narrower"/>    </instanceOf>    <member>      <roleSpec>  <topicRef xlink:href="#narrower"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=62854"/>    </member>    <member>      <roleSpec>  <topicRef xlink:href="#broader"/>      </roleSpec>      <topicRef xlink:href="#https://vocabulario.abcd.usp.br/pt-br/?tema=47530"/>    </member>  </association></topicMap>