Sarcoma
A sarcoma is a bumpy tumor that occurs in the connective tissues (nerves, muscles and bones) anywhere in the body.

Sarcomas are rare, especially in young children. In kids between 10 and 20, sarcomas make up about 20-25% of childhood cancer diagnoses.

Sarcomas can start off being tiny lumps that you can’t feel. They can spread through the body, or metastasize, before they grow big enough to be seen.

There are many different types of sarcomas. Some sarcomas are more likely to occur in children, adolescents and young adults compared to older adults.

With children and adolescents, the most common sarcomas are Ewing sarcoma and osteosarcoma (bone tumors), and embryonal rhabdomyosarcoma and alveolar rhabdomyosarcoma (muscle tumors). About 80-90% of childhood sarcomas are Ewing sarcoma or osteosarcoma.