Adult Fibrosarcoma

**Semantic type:** Neoplastic Process

**Definition:** A malignant mesenchymal neoplasm composed of fibroblasts. It is characterized by collagen production and a herringbone architectural pattern. It is more commonly seen in middle-aged and older adults. It usually affects the deep soft tissues of extremities, trunk, head and neck. Adult fibrosarcomas may recur and metastasize to the lungs and bones.

**Synonyms:** - Fibrosarcoma - Fibrosarcoma (excluding infantile fibrosarcoma) - Fibrosarcoma - not infantile