Source:http://linkedlifedata.com/resource/umls/id/C1318543
NCI: A tumor usually arising in the synovium of joints, bursa or tendon sheath. It is characterized by the presence of mononuclear cells, multinucleated osteoclast-like giant cells, hemosiderin-laden macrophages, foam cells, and an inflammatory infiltrate. According to the growth pattern, it is classified as localized or diffuse.