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Ewing's Sarcoma - A rare and malignant tumor found in immature bone marrow tissue. Ewing's sarcoma, a form of primary bone cancer, occurs most often in children, adolescents and young adults, ages 10 to 20. Nearly 90 percent of the time, Ewing's sarcoma cancer tumors will develop in "long" bones (the middle of large bones) or in the vertebrae, ribs or pelvis. Ewing's sarcoma is named after the doctor who first identified it. Also called Ewing's sarcoma/primitive neuroectodermal tumor (PNET).
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