A malignant mesenchymal fibroblastic neoplasm affecting the soft tissue and bone. The disease is Monarch Disease Ontology identifier MONDO_0005164 (fibrosarcoma). Also known as: fibrosarcoma (disease), fibrosarcoma (excluding infantile fibrosarcoma), fibrosarcoma - not infantile, fibrosarcoma of soft tissue, fibrosarcoma, malignant, fibrous tissue neoplasm, malignant fibromatous neoplasm.