Is this children's cancer (rhabdomyosarcoma) or any kind of cancer?

Rhabdomyosarcoma: This is a malignant tumor of skeletal muscle. It can be seen in kids, but it occurs at all ages.

It is a cancer: Rhabdomyosarcoma is a cancer most commonly seen in children. It appears most commonly in the head and neck, but can occur in other parts of the body also. It is treated with chemotherapy and sometimes surgery or radiation therapy.