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An intermediate, locally aggressive and rarely metastasizing blood vessel neoplasm. It is characterized by the presence of hobnail endothelial cells and formation of arborizing vascular channels. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C27511\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C27511\' NCI Thesaurus)
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