Mesenchymal Non-Meningothelial Tumor of the Central Nervous System

**Semantic type:** Neoplastic Process

**Definition:** Mesenchymal, Non-Meningothelial Tumors are benign and malignant mesenchymal tumors originating in the CNS or the meninges and showing fibrous, fibrohistiocytic, adipose, myoid, endothelial, chondroid or osseous, but not meningothelial differentiation. Depending on their histological features and clinical behavior, their grade ranges from benign neoplasms (WHO grade I) to highly malignant sarcomas (WHO grade IV). (Adapted from WHO.)

**Synonyms:** - Mesenchymal, Non-Meningothelial Tumor of CNS - Mesenchymal, Non-Meningothelial Tumor of Central Nervous System - Mesenchymal, Non-Meningothelial Tumor of the CNS