Subcutaneous Nodular Fasciitis

**Semantic type:** Neoplastic Process

**Definition:** A self-limiting, rapidly growing, non-encapsulated benign neoplasm arising from the subcutaneous tissues. It is characterized by the growth of plump spindle-shaped fibroblasts in a storiform pattern, multinucleated osteoclast-like giant cells, red blood cell extravasation, chronic inflammatory cells, and high mitotic activity.