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Undifferentiated mesenchymal neoplasms can be morphologically subclassified based on cell shape; epithelioid tumors may be diagnostically challenging, particularly since they can show morphologic and immunohistochemical overlap with epithelial neoplasms. Following the recent report of an NR1D1::MAML1 gene fusion in an undifferentiated pediatric neoplasm, we performed a retrospective archival review...
Epithelioid and spindle cell sarcomas with NR1D1::MAML1/2 gene fusions are rare and emerging entities. Only six cases of NR1D1‐rearranged mesenchymal tumors have previously been reported in the literature; they are often characterized by an epithelioid morphology, at least focal pseudogland formation, prominent cytoplasmic vacuoles, and focal to diffuse immunohistochemical expression of keratin. We...
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