Final answer:
Rhabdomyosarcoma is the most common soft tissue sarcoma in children, and it originates from mesenchymal cells. Leukemia is the main type of cancer among children, making up about a third of childhood cancers, and it involves the production of abnormal white blood cells.
Step-by-step explanation:
Although soft tissue sarcomas are rare in children, rhabdomyosarcoma is the most common soft tissue sarcoma of childhood. This type of cancer arises from connective tissue or mesenchymal cells, which are the cells that make up the body’s connective tissues, such as muscles, fat, and blood vessels. Rhabdomyosarcoma is specifically a cancer that looks like skeletal muscle cells in their early stages and can occur anywhere in the body.
While soft tissue sarcomas are rare in the pediatric population, there are other types of cancers that can affect children. Leukemia, for example, is the main type of cancer in children, constituting about one third of all childhood cancers. It develops due to the production of abnormal white blood cells, which can disrupt normal blood function.