<unk>  (fibroblastic sarcoma) is a malignant mesenchymal tumour derived from fibrous connective tissue and characterized by the presence of immature proliferating fibroblasts or undifferentiated anaplastic spindle cells in a storiform pattern.<unk> s mainly arise in people between the ages of 25–79 It originates in fibrous tissues of the bone and invades long or flat bones such as the femur, tibia, and mandible. It also involves the periosteum and overlying muscle.
Fibrosarcoma
Biphenotypic sinonasal sarcoma
Chondrosarcoma
Fibroma
Liposarcoma
Enchondroma
Sarcoma
Clear cell sarcoma