BCOR upregulation in a poorly differentiated synovial sarcoma with SS18L1‐SSX1 fusion—A pathologic and molecular pitfall

Abstract excerpt

The diagnosis of poorly differentiated synovial sarcoma (PD-SS) may be challenging due to overlapping morphologic features with other undifferentiated round cell sarcomas (URCS). Particularly relevant is the histologic overlap and shared BCOR overexpression between a subset of SS and URCS with various BCOR genetic abnormalities. Here, we report a case of PD-SS lacking the canonical SS18-SSX gene fusion, but...

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