Malignant Phosphaturic Mesenchymal Tumor

**Semantic type:** Neoplastic Process

**Definition:** A phosphaturic mesenchymal tumor characterized by the presence of nuclear atypia, high mitotic activity, increased cellularity, marked pleomorphism, and necrosis. It usually develops in lesions that have recurred locally and metastasizes to other sites.

**Synonyms:** - Phosphaturic mesenchymal tumor, malignant