<unk>  is the most common soft-tissue sarcoma in children as well as the third most common solid tumor in children. Recent estimates place the incidence of the disease at approximately 4.5 case per 1 million children/adolescents with approximately 250 new cases in the United States each year. With the vast majority of cases of<unk>  occurring in children or adolescents, two-thirds of reported cases occur in youths under the age of 10.<unk>  also occurs slightly more often in males than in females, with a ratio of approximately 1.3–1.5:1. In addition, slightly lower prevalence of the disease has been reported in black and Asian children relative to white children. In most cases, there are no clear predisposing risk factors for the development of<unk> . It tends to occur sporadically with no obvious cause. However,<unk>  has been correlated with familial cancer syndromes and congenital abnormalities including neurofibromatosis type 1, Beckwith-Wiedemann syndrome, Li–Fraumeni syndrome, cardio-facio-cutaneous syndrome, and Costello syndrome. It has also been associated with parental use of cocaine and marijuana.
Rhabdomyosarcoma
Myosarcoma
Pyomyoma
Rhabdomyoma
Hemangiosarcoma
Liposarcoma
Angiosarcoma
Fibrosarcoma