A very dangerous cancer which develops from striated muscle tissue. There are three major forms: alveolar rhabdosarcoma: this cancer, which most often afflicts adolescents, typically develops in the extremities, body or eye cavities.embryonal rhabdosarcoma: this cancer, which strikes infants and young children, develops in the head, neck, extremities or lower genitourinary tract.pleiomorphic rhabdosarcoma: this cancer strikes adults and typically develops in the extremities.