Undifferentiated Round Cell Sarcomas: Retrospective Morphological, Immunohistochemical, and Molecular Re-Evaluation Including a Unique Case of ZC3H7B::BCOR Fusion.

Undifferentiated round cell sarcomas (URCSs) are aggressive neoplasms with overlapping histology but distinct molecular profiles. Accurate subclassification is crucial for prognosis and therapy, particularly in tumors lacking classic Ewing sarcoma al…

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