Key result
WHO 2020 reclassifies the Ewing sarcoma family into molecularly defined undifferentiated small round cell sarcomas.
Why the study?
The WHO 2020 reclassified Ewing sarcoma into molecularly defined undifferentiated small round cell sarcomas with distinct imaging, pathologic, and molecular features, underscoring the need for radiologists to understand these subtypes.
Design
Review
Facilitates tailored treatment by distinguishing molecular subtypes on imaging; extends the 2020 WHO reclassification of Ewing sarcomas.
The World Health Organization introduced substantial revisions in the 2020 fifth edition of the classification system for bone and soft-tissue tumors, reorganizing what were previously called the Ewing sarcoma family of tumors or Ewing-like sarcomas into a new category of "undifferentiated small round cell sarcomas" based on molecular genetic characteristics. This reclassification established four distinct entities: Ewing sarcoma (ES),
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Mori et al. (2026) studied this question. The WHO 2020 fifth edition reclassified the Ewing sarcoma family into molecularly defined undifferentiated small round cell sarcomas with distinct imaging, pathologic, and molecular features.
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