NCIt 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 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.;
Alternative definition : NICHD: A malignant neoplasm of the bone, or the soft tissue adjacent to bone, that
is comprised of primitive neuroectodermal cells.; NCI-GLOSS: A type of cancer that forms in bone or soft tissue.;
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