The prognosis for<unk>  remains poor. Prognosis depends upon the stage of the cancer. Because the disease can be misdiagnosed or remain undetected, tumors frequently grow large within the abdomen and metastasize or seed to other parts of the body. There is no known organ or area of origin.<unk>  can metastasize through lymph nodes or the blood stream. Sites of metastasis include the spleen, diaphragm, liver, large and small intestine, lungs, central nervous system, bones, uterus, bladder, genitals, abdominal cavity, and the brain. A multi-modality approach of high-dose chemotherapy, aggressive surgical resection, radiation, and stem cell rescue improves survival for some patients. Reports have indicated that patients will initially respond to first line chemotherapy and treatment but that relapse is common. Some patients in remission or with inoperable tumor seem to benefit from long term low dose chemotherapy, turning<unk>  into a chronic disease.
Desmoplastic small-round-cell tumor
Plexiform angiomyxoid myofibroblastic tumor
Perivascular epithelioid cell tumour
Adenomatoid tumor
Solid pseudopapillary tumour
Sclerosing epithelioid fibrosarcoma
Small-blue-round-cell tumor
Multinucleate cell angiohistiocytoma