MONDO_0004187 (nodular fasciitis) is a self-limiting, rapidly growing, non-encapsulated benign neoplasm that arises from the soft tissues. It is characterized by the presence of plump spindle-shaped fibroblasts, multinucleated osteoclast-like giant cells, chronic inflammatory infiltrate, red blood cell extravasation, and high mitotic activity. Also known as: fasciitis - nodular, pseudosarcomatous fasciitis, pseudosarcomatous fibromatosis.