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A rare aggressive malignant mesenchymal neoplasm occurring in children. The neoplasm is characterized by the presence of bizarre round, spindle, and polygonal cells. Clinical presentation includes a rapidly enlarging painful mass usually of the lower extremities. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C7959\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C7959\' NCI Thesaurus)
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