<Tr> <Td> Peripheral nerves </Td> <Td> Malignant peripheral nerve sheath tumour / Neurofibrosarcoma </Td> <Td> Arms, legs, trunk </Td> </Tr> <Tr> <Td> Cartilage and bone - forming tissue </Td> <Td> Extraskeletal chondrosarcoma </Td> <Td> Legs </Td> </Tr> <Tr> <Td> Extraskeletal osteosarcoma </Td> <Td> Legs, trunk (not involving the bone) </Td> </Tr> <Table> Table 2: Major Types of Soft - Tissue Sarcomas in Children <Tr> <Th> Tissue of Origin </Th> <Th> Type of Cancer </Th> <Th> Usual Location in the Body </Th> <Th> Most common ages </Th> </Tr> <Tr> <Td> Muscle </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> <Dl> <Dd> Striated </Dd> <Dd> muscle </Dd> </Dl> </Td> <Td> Rhabdomyosarcoma </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dd> Embryonal </Dd> </Dl> </Td> <Td> Head and neck, genitourinary tract </Td> <Td> Infant--4 </Td> </Tr> <Tr> <Td> </Td> <Td> <Dl> <Dd> Alveolar soft part sarcoma </Dd> </Dl> </Td> <Td> Arms, legs, head, and neck </Td> <Td> Infant--19 </Td> </Tr> <Tr> <Td> <Dl> <Dd> Smooth </Dd> <Dd> muscle </Dd> </Dl> </Td> <Td> Leiomyosarcoma </Td> <Td> Trunk </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> Fibrous tissue </Td> <Td> Fibrosarcoma </Td> <Td> Arms and legs </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> </Td> <Td> Malignant fibrous histiocytoma </Td> <Td> Legs </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> </Td> <Td> Dermatofibrosarcoma </Td> <Td> Trunk </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> Fat </Td> <Td> Liposarcoma </Td> <Td> Arms and Legs </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> Blood vessels </Td> <Td> Infantile hemangio - <Dl> <Dd> pericytoma </Dd> </Dl> </Td> <Td> Arms, legs, trunk, head, and neck </Td> <Td> Infant--4 </Td> </Tr> <Tr> <Td> Synovial tissue (linings of joint cavities, tendon sheaths) </Td> <Td> Synovial sarcoma </Td> <Td> Legs, arms, and trunk </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> Peripheral nerves </Td> <Td> Malignant peripheral nerve sheath tumors (also called neurofibrosarcomas, malignant schwannomas, and neurogenic sarcomas) </Td> <Td> Arms, legs, and trunk </Td> <Td> 15--19 </Td> </Tr> <Tr> <Td> Muscular nerves </Td> <Td> Alveolar soft part sarcoma </Td> <Td> Arms and legs </Td> <Td> Infant--19 </Td> </Tr> <Tr> <Td> Cartilage and bone - forming tissue </Td> <Td> Extraskeletal myxoid chondrosarcoma </Td> <Td> Legs </Td> <Td> 10--14 </Td> </Tr> <Tr> <Td> </Td> <Td> Extraskeletal mesenchymal </Td> <Td> Legs </Td> <Td> 10--14 </Td> </Tr> </Table>

A malignant tumor that occurs in epithelial tisue is a