A benign or malignant mesenchymal neoplasm originating in the central nervous system or the meninges and showing fibrous, fibrohistiocytic, adipose, myoid, endothelial, chondroid or osseous, but not meningothelial differentiation. Depending on the histological features and clinical behavior of these neoplasms, their grade ranges from benign (WHO grade I) to highly malignant (WHO grade IV). (Adapted from WHO). The disease is central nervous system mesenchymal non-meningothelial tumor (MONDO_0003244). Also known as: CNS soft tissue neoplasm, CNS soft tissue tumor, CNS soft tissue tumour, central nervous system mesenchymal, non-meningothelial neoplasm, central nervous system mesenchymal, non-meningothelial tumor, central nervous system mesenchymal, non-meningothelial tumour, central nervous system soft tissue neoplasm, central nervous system soft tissue tumor.