Source:http://linkedlifedata.com/resource/umls/id/C1266128
NCI: A rare soft tissue neoplasm of uncertain lineage characterized by the presence of neoplastic spindle to round cells forming cords in a fibromyxoid stroma. The lesions are associated with the formation of metaplastic bone. Most patients present with painless subcutaneous masses. Recurrences have been reported in a minority of patients.