Intravascular Nodular Fasciitis

**Semantic type:** Neoplastic Process

**Definition:** A rare self-limiting, rapidly growing, non-encapsulated benign neoplasm that arises from the vessels. 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.

**Synonyms:** - Intravascular Fasciitis - Intravascular Pseudosarcomatous Fasciitis