| umls-concept:C0432529 | skos:definition | NCI: A rare, rapid growing, non-encapsulated benign neoplasm that arises from the vessels. It is characterized by the presence of non-hyperchromatic spindle-shaped fibroblasts, multinucleated osteoclast-like giant cells, chronic inflammatory infiltrate, red blood cell extravasation, and high mitotic activity, in a storiform growth pattern. | lld:umls |
