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Extraosseous Ewing Sarcoma definition: This is a rare malignant neoplasm of the soft tissue. It is typically a disease of children and young adults. It is characterized by t(11:22) (q24: q12) resulting in the expression of EWS/FLI-1 chimeric transcript. Most commonly occurs in the paravertebral region, chest wall, pelvis and lower extremities. Treatment includes local excision with consideration for post operative chemotherapy and/or radiotherapy. - 2003
Sarcoma, Ewing's definition: A malignant tumor of the bone which always arises in the medullary tissue, occurring more often in cylindrical bones. There are conspicuous foci of necrosis in association with irregular masses of small, regular, rounded or ovoid cells with very scanty cytoplasm. The tumor occurs usually before the age of 20, about twice as frequently in males as in females. (From Dorland, 27th ed; Stedman, 25th ed)
Ewing's tumor definition: malignant tumor of bones which always arises in medullary tissue, occurring more often in cylindrical bones, with pain, fever, and leukocytosis.
Ewing Sarcoma definition: A small round cell tumor that lacks morphologic, immunohistochemical, and electron microscopic evidence of neuroectodermal differentiation. It represents one of the two ends of the spectrum called Ewing's sarcoma/peripheral neuroectodermal tumor. It affects mostly males under age 20, and it can occur in soft tissue or bone. Pain and the presence of a mass are the most common clinical symptoms.
Ewing Sarcoma/Peripheral Primitive Neuroectodermal Tumor definition: A spectrum of malignant tumors, affecting mostly males under age 20, characterized morphologically by the presence of small round cells. Ewing sarcoma and peripheral primitive neuroectodermal tumor represent the ends of a spectrum, with Ewing sarcoma lacking evidence of neural differentiation and the markers that characterize the peripheral primitive neuroectodermal tumor. Ewing sarcoma and peripheral primitive neuroectodermal tumor may share cytogenetic abnormalities, proto-oncogene expression, cell culture and immunohistochemical abnormalities. These tumors may occur in the soft tissues or the bones. Pain and the presence of a mass are the most common clinical symptoms.
 
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