Soft Tissue Neoplasm of Uncertain Differentiation

**Semantic type:** Neoplastic Process

**Definition:** A benign,intermediate, or malignant soft tissue neoplasm in which the line of differentiation is uncertain. Representative examples include neoplasm with perivascular epithelioid cell differentiation, alveolar soft part sarcoma, desmoplastic small round cell tumor, epithelioid sarcoma, extraskeletal myxoid chondrosarcoma, and synovial sarcoma.

**Synonyms:** - Soft Tissue Tumor of Uncertain Differentiation