A usually aggressive malignant neoplasm arising from the central nervous system. It is characterized by the presence of spindle-shaped fibroblasts and collagenous stroma formation in a herringbone growth pattern. The disease is Monarch Disease Ontology id MONDO_0003882 (central nervous system fibrosarcoma). Also known as: CNS fibrosarcoma, central nervous system fibrosarcoma (disease), fibrosarcoma of CNS, fibrosarcoma of central nervous system, fibrosarcoma of the CNS, fibrosarcoma of the central nervous system.