这个词是什么意思？
A malignant tumor of the bone which always arises in the medullary tissue, occurring more often in cylindrical bones. The tumor occurs usually before the age of 20, about twice as frequently in males as in females.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012512 · MeSH 2026。
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